• Title/Summary/Keyword: 가성소다

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Evaluation of Cleaning Efficiency of Reverse Osmosis Module Using Micro-bubble (미세기포를 이용한 역삼투 모듈 세정 효율 평가)

  • Kim, Dongjin;Kang, Shingyung;Cho, Hayoung;Lee, Jeawoo;Moon, Ilshik
    • Membrane Journal
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    • v.27 no.1
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    • pp.104-107
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    • 2017
  • Among many methods in solving the organic contamination in the reverse osmosis operation, caustic soda (NaOH) wash method is efficient and commercially affordable. In continuation of our many organic pollution removal works, this study focused mainly on caustic soda wash with micro-bubble to removal the organic contamination of the spent membrane from reverse osmosis process. First, the membrane was forced the pollute using known organic pollutants such as Humic acid, Bovine serum albumin, Sodium alginate drug. The organic contamination on the membrane was monitored flux. The decontamination of organic contaminants was derived flux variation at individual caustic soda was injected micro-bubble methods and combined method as well. the found results explain removal of organic contaminants effective only by combined caustic soda wash with micro-bubble methods.

A Study on Recycling NaOH from Pre-treatment Process with Concentration Control System - Scouring Ability of Cotton Fabric Treated with Recycled NaOH - (농도제어장치를 이용하여 면직물 전처리 공정에서 발생하는 가성소다 폐액의 재활용에 관한 연구 - 재활용 가성소다에 의한 면직물의 정련성 -)

  • Lee, Un-Pill
    • Fashion & Textile Research Journal
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    • v.6 no.3
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    • pp.393-398
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    • 2004
  • This research offers recycling method of NaOH from mercerizing process of cotton fabric. The measuring system of NaOH concentration was designed for the mercerizing process and tested for various conditions which can be occurred in factory. The accuracy of the system was varied as the testing condition was changed. As the concentration of sulfuric acid used for titrating NaOH decreased, the accuracy of measuring system increased. The concentration of NaOH for waste water collected from mercerizing process was measured by 5.2%. As the ratio of newly mixed NaOH increased, moisture regain. water absorbency and whiteness of the specimen increased. The bending rigidity(B) and shear rigidity(G) decreased, as the ratio of newly mixed NaOH increased.

Design of an Automatic Titration System for Caustic Soda Treatment System Using the Equivalent Point Estimation Algorithm (당량점 예측 알고리듬에 의한 가성소다 처리 섬유감량 시스템용 자동적정 장치 설계)

  • Cho, Jin-Ho;Jin, Kyoung-Chan;You, Byoung-Heui;Koo, Sung-Mo;Kim, Myoung-Nam;Lee, Jong-Hyun;Lee, Heung-Lark
    • Journal of Sensor Science and Technology
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    • v.3 no.3
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    • pp.28-35
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    • 1994
  • Caustic Soda Treatment Systems need a concentration measurement device in order to monitor the weight reduction amount of polyester fabrics. Since the reduction process requires several concentration measurements, we have to do the unit titration fast and exactly. Therefore, a proposition of estimation algorithm for finding the equivalent point in the titration process is needed. In this paper, we used the cardinal spline algorithm, to estimate the proper curve with the measured pH-values after each injection of titration sdution, to predict the equivalent point. While the processing time is elapsed, several equivalent points are estimated and drawed the line graph of fabrics weight reduction automatically. Finally, we designed the hardware and the software of an automatic titration system that can generate the reduction ending signal of Caustic Soda Treatment System.

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Studies on the Sequestering Agents to Replace Silicate in Peroxide Bleaching System (과산화수소 보존표백시 Silicate 대체 약품에 관한 연구)

  • Kim, Sung-Kwon;Choung, Sung Wook;Michalowski, R.J.
    • Applied Chemistry for Engineering
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    • v.9 no.5
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    • pp.754-757
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    • 1998
  • This study was carried out to investigate the effect of replacing silicate by Versenate PS peroxide stabilizer in a peroxide bleaching system of deinked pulp process. To evaluate the possibility of replacement, optimization of pretreatment and caustic in bleaching for stock treated with silicate and Versenate PS were performed. After these performance, residual peroxide content and brightness were measured. Results obtained form this study were summarized as follows : 1. Caustic concentration in bleaching system treated with silicate was optimized at 2.5~3.0%. 2. Caustic concentration in bleaching system treated with Versenate PS was optimized at 1.0~1.5%. 3. Versenate PS alone did not provide satisfying bleaching effect. 4. Bleaching system treated with Versenate PS had potential to reduce silicate. 5. DTPA pretreatment provided higher bleaching efficiency.

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CFD Analysis on the Internal Reaction in the SNCR System (SNCR 시스템 내부의 물질 반응에 관한 전산해석적 연구)

  • Koo, Seongmo;Yoo, Kyung-Seun;Chang, Hyuksang
    • Clean Technology
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    • v.25 no.1
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    • pp.63-73
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    • 2019
  • Numerical analysis was done to evaluate the chemical reaction and the reduction rate inside of selective non-catalytic reduction to denitrification in combustion process. The $NO_X$ reduction in selective non-catalytic reduction is converted to not only nitrogen but also nitrous oxide. Simultaneous $NO_X$ reduction and nitrous oxide generation suppressing is required in selective non-catalytic reduction because nitrous oxide influences the global warming as a greenhouse gas. The current study was performed compare the computational analysis in the same temperature and amount of NaOH, and in comparison with the previous research experiments and confirmed the reliability of the computational fluid dynamics. Additionally, controlling the addition amount of NaOH to predict the $NO_X$ reduction efficiency and nitrous oxide production. Numerical analysis was done to check the mass fraction of each material in the measurement point at the end of selective non-catalytic reduction. Experimental Value and simulation value by numerical analysis showed an error of up to 18.9% was confirmed that a generally well predicted. and it was confirmed that the widened temperature range of more than 70% $NO_X$ removal rate is increased when the addition amount of NaOH. So, large and frequent changes of the reaction temperature waste incineration facilities are expected to be effective.

월간닭고기

  • 한국계육협회
    • Monthly Korean Chicken
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    • v.6 no.7 s.61
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    • pp.2-7
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    • 2000
  • 축산물 외식업체(음식점) 원산지 표시 반드시 이루어져야 - 더위 스트레스에 효과적인 육계 사양 관리 - 타우린 생산하는 닭사육방법 개발 - 브라질, 사료가격 상승과 공급과잉으로 계육가격 급락 - 효소 및 가성소다 처리로 우모분의 영양가 향상 - 미국계육가공전문가 초청 세미나 개최 - 농림부, 99년도 1인당 닭고기 소비량 8.9kg으로 발표 - 강력 조혈 강장 영양제 훼르콥상 판매 급증

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Modeling for the Recovery of Organic Acid by Bipolar Membrane Electrodialysis (바이폴라막 전기투석에 의한 유기산 회수에 관한 모델링)

  • Kim, Sang-Hun;Lee, Byung-Chul
    • Korean Chemical Engineering Research
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    • v.44 no.5
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    • pp.476-482
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    • 2006
  • This paper studied the recovery of organic acid from organic acid salt by using bipolar membrane electrodialysis. Acetic acid and lactic acid was used as for organic acid. Organic acid concentration, sodium hydroxide concentration and pH values were measured at various current density. Organic acid salt was effectively converted to organic acid and sodium hydroxide. Based on the experimental results, mathematical models were developed, in which time changes in ion balance were considered. Model predictions of organic acid concentration, sodium hydroxide concentration and pH values were in good agreement with the experimental data.

OCC 고지의 원료 특성 연구

  • 조신환;이종필;구재은;김현호
    • Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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    • 2000.11a
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    • pp.131-131
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    • 2000
  • 백판지, KL, 지관원지, 석고원지 등의 산업 용지 지종에 주로 ace 계통의 저급 고지가 원료 로 주로 사용되고 있다 .. ace 고지는 크게 원산지별로 약간씩 상이한 물성을 나타내고 있는데 각 원지 요구 특성도 각각 다양하다. 효율적인 ace 고지의 이용을 위해서는 ace 고지 자체의 외관 특성 및 물리적인 특성을 정확하게 파악하는 것이 중요하다. 그러므로 본 연구에서는 각 O ace 원료의 특성을 파악하여 각 원지 특성에 적합한 물성을 나타내기 위한 ace data를 얻고 자하였다. 미산 ace, 국산 ace, 일본 ace의 물성을 측정하였다. 실험 결과 열단장이 각각 2.94, 2. 3 35, 2,2km로 미산 ace가 가장 우수하였고, 국산과 일본 ace 는 비슷한 열단장을 나타내고 있다. 파열강도도 역시 미산 ace가 가장 우수하였고, 국산과 일본 ace 는 비슷한 강도를 나 타내고 있다. 내절도의 경우에도(1.0kgf 압력하) 미산, 국산과 일본산이 각각 124, 19, 18회 를 나타내고 있다. 해리성의 경우에는 국산과 일본산은 98.9%의 해리율로 유사한 특성을 나타내고 있으나, 미 국산의 경우에는 89.0-96.9%로 상당히 낮은 해리율을 나타내고 있는데 미국산 ace의 경우에 는 습윤시 강도 향상을 위하여 습윤지력중강제의 투입으로 인하여 섬유 해섬에 방해가 되기 때 문이다. 해리성 향상을 위하여 펄핑 방법, 시간, 약품 (가성소다, 해리촉진제 등), Kneader 처 리 둥을 시도하여 보았다. 펄핑 시간과 가성소다의 투입 영향이 가장 큰 효과를 나타내었다. 이물질함량은 국산 ace가 가장 많았고, 미산, 일본산 ace가 가장 적었다.

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Preparation and Characterization of Copper Oxychloride from Acidic Copper Chloride Etchant (PCB 산업에서 배출되는 산성 염화동 폐액으로부터 Copper Oxychloride의 제조 및 특성분석)

  • 김영희;김수룡;정상진;이윤주;어영선
    • Resources Recycling
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    • v.12 no.2
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    • pp.3-10
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    • 2003
  • Copper oxychloride used as an agricultural fungicide has been recovered from copper-containing waste etchant by the neutralization with alkali hydroxides. Large amount of copper-containing waste etchant is generated from Printed Circuit Board industry. In an environmental and economic point of view, retrieve of the valuable natural resource from the waste is important. Recycling process of copper oxychloride from the waste etchant is discovered through the our study. In the range of reaction temp. 2$0^{\circ}C$-4$0^{\circ}C$, pH 5-7, pure copper oxychloride was able to prepare and the yield of copper oxychloride was higher than 95%. Physical properties of the sample have been characterized using SEM, XRD, TGA, ICP and Atomic absorption spectroscopy.