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Ortho 붕산의 탈수반응

Dehydration of Ortho Boric Acid

강용 조수행 박소진 최명재 이규완

Kang Y Cho SH Park SJ Choi MJ Lee KW

HWAHAK KONGHAK, April 1992, 30(2), 212-220(9), NONE

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Abstract

Ortho 붕산의 탈수반응에 의해서 n-파라핀의 액상 산화반응 조절을 위한 에스테르화제로 적합한 meta 붕산을 얻었다. Meta 붕산 생산공정의 설계 및 scale-up을 위한 기초자료를 얻기 위하여 ortho 붕산의 탈수반응특성, 반응조건이 meta 붕산 생성 전환율에 미치는 영향 등을 고찰하여 meta 붕산 생성의 최적반응조건을 도출하였다. 붕산입자의 평균입경, 탈수반응온도 및 압력, 붕산슬러리상의 반응입자함유율, 교반속도, 반응시간 등이 실험 변수로 다루어졌으며, ortho 붕산의 탈수반응을 액체-고체입자반응의 불균일계반응 모델로 해석하였다. 본 연구의 결과 ortho 붕산의 탈수반응은 붕산입자에서의 확산이 반응속도결정 단계로 나타났으며, 경제성을 고려한 반응의 최적조건은 다음과 같이 결정되었다. 반응시간 : 35-40분, 반응온도:135-140℃, 교반속도:700-800rpm, 슬러리 농도 : 25-28wt%, 붕산입자크기 : 0.20-0.35mm, 반응압력 : 700-720mmHg.

Meta boric acid which can be used in the esterification for the control of liquid oxidation of n-paraffin was obtained by dehydration of ortho boric acid. The characteristics of dehydration or ortho boric acid and effects of the experimental variables on the conversion of ortho boric acid to meta boric acid were examined in order to obtain the basic data which are required for the design and scale-up of process producing meta boric acid. Particle size, reaction temperature and pressure, particle content in the slurry phase, mixing speed and reaction time were chosen as operating wvariables, and the reaction was analyzed in terms of a heterogeneous liquid-solid reaction model. From the results of this study, the diffusion in the particle was presumed as the rate determining step, and the optimum conditions for this reaction were determined as follow in view of economics : t(reaction time_:35-40min, T(reaction temperature):135-140℃, R(mixing speed):700-800rpm, S(slurry content)25-28wt%, d_p(particle size):0.20-0.35mm, P(reaction pressure):700-720mmHg.

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