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All Journal Majalah Forum Teknik UGM Matematika dan Sains Seminar Nasional Teknik Kimia Kejuangan Jurnal Teknik Kimia Indonesia
Sugeng Winardi
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Engineering Environmental Science Mathematics

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STUDI HIDROLISIS ENZIMATIK JERAMI PADI UNTUK PRODUKSI HIDROGEN MENGGUNAKAN CAMPURAN CRUDE SELULASE DARI Nadiem Anwar, ; Arief Widjaya, ; Sugeng Winardi,
Matematika dan Sains Vol 17, No 2 (2010)
Publisher : Matematika dan Sains

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Abstract

The aims of research are to compare effectifity the mixture of cellulase enzyme crude from Trichoderma reesei and Aspergillus niger with comercial A. Niger cellulase from Fluka Biochemika and study enfluence of enzyme ratio to substrat. Enzyme crude was made by solid fermentation. T. reesei was incubated for 6 days, while A. niger was incubated for 8 days. One unit activity of A. niger cellulase was mixed with two unit activity of T. reesei cellulase. The straw was milled and was sieved 120-140 mesh, then delignificated using NaOH 2% for 6 hours and at themperature of 85 oC. Yield of glucose was analyzed by dinitrosalycilic acid and measured using spectrophotometer at wavelength of 540 nm. Experiment results showed that the mixture of cellulase enzyme crude from T. reesei and A. niger 2 : 1 U/U was similar with commercial A. niger cellulase in case the bigger enzyme used, the bigger glucose resulted, but its ascension became smaller so enzyme efficiency decreased. The mixture of cellulace crude enzyme of T. reesei with A. niger of 2 : 1 U/U, two times more effective in hydrolizing the cellulose of the straw was compared with comercial A. niger cellulase from Fluka Biochemika.oC. Yield of glucose was analyzed by dinitrosalycilic acid and measured using spectrophotometer at wavelength of 540 nm. Experiment results showed that the mixture of cellulase enzyme crude from T. reesei and A. niger 2 : 1 U/U was similar with commercial A. niger cellulase in case the bigger enzyme used, the bigger glucose resulted, but its ascension became smaller so enzyme efficiency decreased. The mixture of cellulace crude enzyme of T. reesei with A. niger of 2 : 1 U/U, two times more effective in hydrolizing the cellulose of the straw was compared with comercial A. niger cellulase from Fluka Biochemika.
Study micromixing pada tangki teraduk secara kontinyu Ali Altway; W Widiyastuti; M Rachimoellah; Sugeng Winardi
Jurnal Teknik Kimia Indonesia Vol 3, No 1 (2004)
Publisher : ASOSIASI PENDIDIKAN TINGGI TEKNIK KIMIA INDONESIA (APTEKIM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jtki.2004.3.1.3

Abstract

The aim of this work is to study the influence of micromixing on product distribution for parallel reaction systems in an agitated tank. The understanding of micromixing is needed besides macromixing to obtain the optimum process. The neutralization reaction of NaH2BO3 and oxidation-reduction reaction between lodide-lodate to generate iodine are selected to perform parallel reaction systems. These reactions were conducted in a flat bottom cylindrical tank 0.2 m in diameter (T) at room temperature (30oC) agitated by six blades fan turbine having diameter (Da)=1/3T and impeller width (W)=1/4T. The impeller clearance was I/3H. The height of liquid in the tank is equal to its diameter (H=T). This tank was operated as continuous reactor type. The inf1uences of impeller speed, residence time and feed position were analyzed. Segregation number and the yield of iodine generation determine the micromixing degree and the performance of reactor respectively. The impeller rotation speed was varied 100-300 rpm. The residence time varied 6.01, 4.005 and 3.005 minutes. The feed position was varied on [r"=r/D, z'=z/H] cylindrical coordinate as follows [1.4, 180o, 0.23], [1.4, 180o, 0.33] and [2.4, 180o, 0.92] which represent bulk swept impeller and near surface regions respectively. By increasing the impeller rotation speed and residence time, the iodine yield decrease.The iodine yield is proportional to segregation number. The segregation number Leads to micromixing degree which higher micromixing degree corresponds to the iodine yield decreasing. The impeller swept position gives the smallest the iodine yield compared to others. Keywords: Micromixing, Yield, Segregasion Number.AbstrakPenelitian ini bertujuan untuk mempelajari pengaruh micromixing pada distribusi produk untuk reaksi paralel dalam sistem tangki teraduk. Pemahaman tentang micromixing dalam suatu sistem diperlukan disamping macromixing untuk mendapatkan proses yang optimum. Pada penelitian ini reaksi paralel ini diwakili oleh reaksi netralisasi NaH2BO3 dan reaksi oksidasi-reduksi Iodide-lodate yang menghasilkan lodin. Reaktor beroperasi kontinyu pada suhu kamar (30oC) berupa tangki silinder berdasar datar berdiameter (T)=0.2 m yang diaduk dengan fan turbin enam blade berdiameter (Da)=1/3T dan lebar impeller (W)=1/4T yang dipasang 1/3H dari dasar. Tinggi cairan sama dengan diameter tangki (H=T). Pengaruh kecepatan putar impeller, waktu tinggal dan posisi umpan dianalisa. Bilangan segregasi dihitung untuk menentukan derajat micromixing dan menghitung yield pembentukan iodin untuk menentukan unjuk kerja reaktor. Kecepatan putar impeller divariasi 100-300 rpm. Waktu tinggal divariasikan 6.01, 4.005 and 3.005 menit. Posisi umpan [r'=r/D, z'=z/H] yang merupakan koordinat silinder divariasikan [1.4, 180o, 0.23], [1.4, 180o, 0.33] and [2.4, 180o, 0.92] yang menyatakan masing-masing daerah bulk bawah, sapuan impeller dan dekat permukaan. Semakin tinggi kecepatan putar impeller dan semakin lama waktu tinggal, yield iodin yang dihasilkan semakin keci1. Yield iodin yang dihasilkan sebanding dengan bilangan segregasi. Bilangan segregasi menunjukkan tingkat micromixing dimana semakin besar tingkat micromixing semakin kecil yield iodin yang dihasilkan. Posisi umpan yang memberikan yield iodin yang terkecil adalah pada daerah sapuan impeller. Kata Kunci: Micromixing, Yield, Bilangan Segregasi.
Pengaruh Sudut Masuk Impeller Terhadap Pola Alir Dalam Reaktor Biogas dengan Side Entering Mixer Mochammad Murtadho; Yukh Ihsana; Ni’am Nisbatul Fathonah; Sugeng Winardi; Tantular Nurtono; Kusdianto .
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2017: PROSIDING SNTKK
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

Side-entering impeller is widely used in the biogas plant. Liquid effluent is processed anaerobically in a hugetank with a relatively small impeller-to-tank diameter ratio.The purpose of this research is to study the sideeffects of entering angle against the flow characteristics in a stirred tank with side-entering mixers (SEM)using flow visualization techniques. This work was conducted on the tank cylinder with a diameter of 40 cmand 40 cm high liquid. Impeller 3-blade propeller which made from stainless steel with 3 and 4 cm indiameter. Variable speed rotary impeller used is 100 to 400 rpm. Side entry angle used are 5 °, 10 °, and 15 °right and left side.Visualization techniques used in this research, specifically focus on the light liquid layervertically and horizontally desired then photographed with a DSLR camera and observation in order tocharacterize the flow pattern. In the type of impeller propeller with an increase in rotational speed, thegeneral layout circulation flow getting to the top is almost half of the liquid level. The changes of side entryangle does not really give much influence over the location of the circulation flow that occurs in the tank.
Extraction of Phytochemical Compounds from Pressed-Palm Fiber Using Water and Pressurize Carbon Dioxide Putu Adhitya Dita Putra; Bella Putri Novitasari; Sugeng Winardi; Tantular Nurtono; Kusdianto Kusdianto; Siti Machmudah
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2017: PROSIDING SNTKK
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Sub-critical extraction of palm oil from pressed palm fiber using water and preassured carbon dioxide solventwas conducted via the dynamic mode to investigate the ability of water and CO2 to extract α-tocopherol, β-carotene, and phenolic compounds. The yield of palm oil and the solubility of α-tocopherol, β-carotene, andphenolic compounds were investigated at 120; 140; 160; and 180oC and pressure range from 30–100 bar. Theextracted oil was analysed α-tocopherol, β-carotene, and phenolic compounds content using UV–Visspectrophotometry. The results The temperature increase on the process of extracting hydrothermal on thetemperature (120-180oC) increase yield α-tocopherol .The steady to extract α-tocopherol , an acid palmitateand β-carotene on the temperature 180oc with pressure 10 MPa .From the experiment done get the best resulton the temperature 180oC to pressure 10 MPa with yield α-tocopherol 271,28 mg/g sample (% recovery is73,06%), yield pamitate acid 2,066 mg/g sample (% recovery is 0,55% ), and yield β-carotene 0,008 mg/gsample (% recovery is 0,0021 %) as compared to that achieved through conventional palm oil processingindicates that extraction of α-tocopherol, β-carotene, and phenolic compounds using this methode is viable.
Curcurmin Micronization from Temulawak (Curcuma Xanthorrhiza) Extract Using Supercritical Co2 as Anti-Solvent Sugeng Winardi; Trifena Widyasari Christy; Shinta Showiantari; Sarah Duta Lestari; Siti Machmudah; Kusdianto Kusdianto
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2017: PROSIDING SNTKK
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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The aim of this study is to compose curcumin microparticle from temulawak extract (curcuma xanthorrhiza) using SAS (Supercritical Anti-Solvent) method with supercritical CO2. Curcumin is made from temulawak extract that insoluble in water. One of method to increase solubility of curcumin in water is decrease particle size. SAS method is being chosen using supercritical CO2 as anti-solvent because temulawak is perfectly soluble in supercritical CO2. Micronization is performed inside precipitator equipped with filter at the bottom. Temperature is being operated in 35 and 40 oC, and in pressure 8 and 10 MPa. Flow rate ratio supercritical CO2 to solution is 15;0,25 and 15;0,30 mL/min. The results show significant effect of pressure and ratio flow rate Supercritical CO2 to solution on the morphology of micronized curcumin particles. The suitable conditions for curcumin micronization in this work were found to be at 8 MPa, 35 oC and flow rate ratio CO2 to solution is 15;0,25 mL/min.The Supercritical Anti-Solvent (SAS) method could be employed for the micronization curcumin particles. Moreover, the dissolution rate curcumin particles using SAS is higher than unprocessed curcumin particles.
Aplikasi Packet Diffusion Model untuk Menganalisis Pengaruh Fenomena Micromixing terhadap Jalannya Reaksi Kimia Paralel di dalam Reaktor Tangki reraduk Kontinyu dengan Aliran Umpan Terpisah Ali Altway; Sugeng Winardi; M Rachimoellah
Forum Teknik Vol 28, No 2 (2004)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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The effect of turbulent  mixing on  the  course  of two fast parallel competitive  chemical reactions  (netralization  of sodium  biborate  snd  iodide-iodate  oxidation-reduction  reactions) carried  out  in  continuous  stiwed  tank  reaktors  have been  studied  theoretically,  using  PacketDiffusion  Model,  and  experimentally  to  validate  the  theoretical predictions.System studied  consists  of flat bottom  cylindrical  tank  0.2 m in  diameter.  The height of liquid  in  the  tank  is  also  0.2 m. The  tank  was equipped  with Fan Turbine  with diameter equal  to I/3  tank  diameter. Sulphuric  acid solution  (0.5  Il,Q was fed into  the  tank through  2 mm-diameter pipe,  and  the  aquous  solution containing 0.0909  M NaH2Boj,  0.0909  M H:Bo:,  0.0116667  M KI, and  0.0023333  M KIO3wasfed  into  the  tank  through  I0  mm-diameter  pipe.  The rate  of acid solution  was  varied  0,045,  0.068,  and 0.09  liter/minute,  while the  rate  of  the  other solution  was varied  I,  1.5,  and  2 liter/minute  (the  rate  variation  coruespond  to  the  mean residence  time variation of 6, 4, and 3 minutes). The  impeller  rotation  speedwas  varied;  9,12,  and  I5  rps.  The iodine  concenftation  in  the  tank  influent  was  analyzed  using  spectrophotometer.The  simulation  works  conclude  that  the  selectivity  of iodine  decrease  with  increasing impeller  rototion  speed for the  mean  residence  time of 3 and 4 minutes,  while for the  mean residence  time of  6 minutes,  the iodine  selectivity increase  with  increasing  impeller  rotation speed. Increasing  the  mean residence  time from 3 to  4 minutes will decrease  the  iodine selectivity, while  increasing  the  mean residence  time further to  6 minutes  will  increase  the selectivity.  The theoretical  prediction  using  Packet  Difusion  Model agree fairly well  with  the experimental data.  The  experimental studies  also  showed  that  the feed position  in  the  region  of high  turbulent  intensity  (impeller  region)  give  lower iodine  selectivity compaired  to  the selectivity  in  the  region  of lower  turbulent  intensity.  The  Packet  Dffision  Model  cannot simulate  the  effect  offeed  position  on the  iodine  selectivity.Keywords:  Packet  Diffusion Model, Micromixing, and  Continuous  Stirred  Tank  Reactor
The Effect of pH to Drying Process of Colloidal Silica Using Flame Spray Combusto Sugeng Winardi; A. Y. Retnaningtyas; R. R. Hidayat; Lailatul Qomariyah; Widiyastuti Widiyastuti; Kusdianto Kusdianto
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2017: PROSIDING SNTKK
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

Spray drying widely applied in industry for drying the material because it has many advantages including capable to produce particle up to nanometer size, having a continuous process, and high purity. The method that we used in this research is Flame Spray Combustor. This research has the objective to synthesize particles of silica from waterglass and determine the effect of pH on particle silica produced. Analysis of SEM, XRD, and BET was conducted to determine the morphology, crystallinity, particle’s size, surface area and pore size of the silica particles produced. Morphology of silica is small spherical and has an amorphous structure. At pH 8 to 10 the size of silica particles increases with increasing pH, and at pH 11 the size decreases. The higher pH, the smaller surface area of silica particles produced. Meanwhile, the greater pH, the greater pore size of silica particles produced.
Co-Authors A. Y. Retnaningtyas Ali Altway Arief Widjaya Bella Putri Novitasari Kusdianto . Kusdianto Kusdianto Lailatul Qomariyah M Rachimoellah Mochammad Murtadho Nadiem Anwar Ni’am Nisbatul Fathonah Putu Adhitya Dita Putra R. R. Hidayat Sarah Duta Lestari Shinta Showiantari Siti Machmudah Tantular Nurtono Trifena Widyasari Christy W Widiyastuti Widiyastuti Widiyastuti Yukh Ihsana