文献类型：期刊文献

英文题名：Optimization of the separation unit of methanol to propylene (MTP) process and its application

作者：Wang, Zizong[1,2];Liu, Hongqian[3];Wang, Jiming[1]

机构：[1]East China Univ Sci & Technol, Shanghai 200237, Peoples R China;[2]China Petrochem Corp, Beijing 100029, Peoples R China;[3]SINOPEC Engn Inc, Beijing 100101, Peoples R China

年份：2019

卷号：27

期号：5

起止页码：1089

外文期刊名：CHINESE JOURNAL OF CHEMICAL ENGINEERING

收录：;EI(收录号：20191506747886);WOS:【SCI-EXPANDED(收录号:WOS:000472199000014)】；

基金：Supported by Sinopec Group company commissioned development project (contract number: 412101).

语种：英文

外文关键词：Heat integration distillation; Methanol to propylene; Ethylene; Propylene

摘要：Based on a typical gas composition from a methanol-to-propylene (MTP) reactor, and guided by a requirement to recover both propylene and ethylene, three separation strategies are studied and simulated by using PROII package. These strategies are sequential separation, front-end dethanization, and front-end depropanization. The process does not involve an ethylene refrigeration system, using the separated stream as absorbent, and absorbing further the medium-pressure demethanization, and a proprietary technology by combining intercooling oil absorption and throttle expansion. Influences of different process streams as absorbent are studied on energy consumptions, propylene and ethylene recovery percentages, and other key-performance indicators of the separation strategies. Based on a commercial MTP plant with a methanol capacity of 1700 kt.a(-1), the simulated results show that the front-end dethanization using the C-4 mixture as absorbent is the optimal separation strategy, in which the standard fuel oil consumption (a key-performance indicator of energy consumption) is 18.97 kt.h(-1), the total power consumption of two compressors is 22.4 MW, the propylene recovery percentage is 99.70%, and the ethylene recovery percentage is 99.70%. For a further improvement, the pre-dethanization and thermal coupling methods are applied. By using front-end pre-dethanization (partial cutting) with debutanizer-overhead, i.e. the CA mixture, as absorbent, the power consumption of the compressors decreases to 19.9 MW, an 11% reduction compared with the clear-cutting method. The energy consumption for the dual compressors for crude gaseous product mixture and main product propylene refrigeration is 16.69 MW, 16.55% lower than that of the present MTP industrial plant with the same scale, and a total energy consumption of 20 MW for the triple compressors including product gas mixture compression, and ethylene and propylene refrigeration. (C) 2019 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.