Thermal decomposition and safety relief for methanol-acetic anhydride system

doi:10.3969/j.issn.0438-1157.2014.04.052

CIESC Journal ›› 2014, Vol. 65 ›› Issue (4): 1537-1543.DOI: 10.3969/j.issn.0438-1157.2014.04.052

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Thermal decomposition and safety relief for methanol-acetic anhydride system

DENG Jiping¹, SUN Xin¹, CHEN Wanghua¹, DONG Guoqiang², LÜ Jiayu¹

1 Department of Safety Engineering, School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094, Jiangsu, China;
2 Institute of Industrial Hygiene of Ordnance Industry, Xi' an 710065, Shaanxi, China

Received:2013-07-12 Revised:2013-09-03 Online:2014-04-05 Published:2014-04-05
Supported by:
supported by the Graduate Research and Innovation Program of Jiangsu Province(CXZZ13_0187).

甲醇-乙酸酐体系的热分解特性及安全泄放

邓吉平¹, 孙欣¹, 陈网桦¹, 董国强², 吕家育¹

1 南京理工大学化工学院安全工程系, 江苏南京 210094;
2 兵器工业卫生研究所, 陕西西安 710065

通讯作者: 陈网桦
作者简介:邓吉平（1982—），男，博士研究生，助理研究员。
基金资助:
江苏省研究生科研创新计划项目（CXZZ13_0187）。

Abstract

Abstract: Emergency relief systems for reducing risk of runaway reactions are being used as one of the most cost-effective technical measures. Therefore, in order to design the pressure relief system sizing, research on a 38.6% methanol-acetic anhydride was carried out based on the bench-scale Phi-TEC Ⅱ calorimeter apparatus. Parameters of thermal behavior were measured with thermal inertia 1.1. Results show that self-heating decomposition temperature tends to be around 37℃, with its corrective heat of the reaction being 205.2 kJ·kg^-1. The fitting equation obtained from experimental data is basically in accord with Antoine equation. The reactive system can be identified as a vapor system. The mass flow capacity and the average two-dimensional flowing capacity per cross-section unit area of the vent-line were determined by Leung's method and ERM. Thus, the required relief area was determined to be 1.36×10^-3 m². Thus, it is proved that the Phi-TEC Ⅱ calorimeter can be used to supply the basic runaway chemical reaction data and in turn provide technical supports for the emergency relief system, which is helpful to improve the reliability of the safety relief design.

Key words: methanol-acetic anhydride, pyrolysis, relief, reactors, safety

摘要： 安全泄放是在失控条件下降低反应体系风险最为经济有效的技术措施之一。为了研究泄放口的设计，利用高性能绝热量热仪Phi-TEC Ⅱ对质量分数38.6%的甲醇-乙酸酐体系进行了测试，得到热惯量为1.1条件下该体系的热行为参数。测试结果表明，该体系的起始分解温度为37℃，比反应热205.2 kJ·kg^-1；拟合得到温度与压力的关系基本符合Antoine方程，确定了反应体系的泄放类型属蒸汽体系；采用Leung方法和平衡速率模型ERM对该体系的安全泄放量和泄放能力进行了计算，求得泄放面积为1.36×10^-3 m²；低热惯量的Phi-TEC Ⅱ可以为工艺放大的泄放设计提供准确、可靠的基础数据。

关键词: 甲醇-乙酸酐体系, 热解, 泄放, 反应器, 安全

CLC Number:

X933

DENG Jiping, SUN Xin, CHEN Wanghua, DONG Guoqiang, LÜ Jiayu. Thermal decomposition and safety relief for methanol-acetic anhydride system[J]. CIESC Journal, 2014, 65(4): 1537-1543.

邓吉平, 孙欣, 陈网桦, 董国强, 吕家育. 甲醇-乙酸酐体系的热分解特性及安全泄放[J]. 化工学报, 2014, 65(4): 1537-1543.

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Thermal decomposition and safety relief for methanol-acetic anhydride system

甲醇-乙酸酐体系的热分解特性及安全泄放

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