Material recovery and utilization device and method for producing ethylene glycol from synthesis gas
A technology of ethylene glycol and synthesis gas, applied in the field of coal chemical industry, can solve the problems of low recovery rate, poor safety and high cost, and achieve the effects of low investment, increased safety and high safety
Active Publication Date: 2022-08-09
CHINA SHENHUA COAL TO LIQUID & CHEM CO LTD +1
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Problems solved by technology
[0007] The purpose of the present invention is to provide a material recovery and utilization device for producing ethylene glycol from synthesis gas and its method, the device can separate and reuse methyl nitrite in the circulating gas, and the esterification and carbonylation tail gas of the synthesis gas to ethylene glycol plant does not contain explosive methyl nitrite at all, and at the same time, the NO is separated and reused, and the remaining The gas can be used in the fuel gas pipeline network, which avoids the environmental and health problems caused by the torch discharge of the circulating gas under the normal production and shutdown conditions of the device, and is more environmentally friendly and safe
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Embodiment 1
[0069] The material recovery and utilization method of synthesis gas to ethylene glycol adopts Figure 5 The device shown includes: a methanol supply unit 1, an esterification carbonylation reaction unit 2 and a tail gas recovery processing unit 3 that are connected in sequence by pipelines, wherein the esterification carbonylation reaction unit 2 includes a MN synthesis unit 21 and a DMO synthesis unit 22 , the exhaust gas recovery and treatment unit 3 includes a washing unit 31 and an absorption / analysis unit 32 . The methanol supply unit 1 is communicated with the washing unit 31, the connecting pipeline between the washing unit 31 and the methanol supply unit 1 is provided with a heat exchanger 11a, the connecting pipeline between the methanol supply unit 1 and the washing unit 31 is provided with a refrigerator 11b, and the methanol supply unit A gas-liquid separator 12 and a heater 11c are provided on the connecting pipeline between 1 and the esterification and carbonyla...
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The invention relates to the technical field of coal chemical industry, and discloses a material recycling device and a method for producing ethylene glycol from synthesis gas. The device comprises a methanol supply unit (1), an esterification and carbonylation reaction unit (2) and a tail gas recovery and treatment unit (3) which are connected in sequence by pipelines, and the tail gas recovery and processing unit (3) comprises: washing pipelines connected in sequence A unit (31) and an absorption / analysis unit (32); the washing unit (31) is used for recovering methyl nitrite in the tail gas; the absorption / analysis unit (32) is used for recycling NO in the tail gas to Esterification carbonylation reaction unit (2). The device provided by the invention can separate and reuse the methyl nitrite and NO in the circulating gas and use the remaining gas as fuel, thereby avoiding the environmental and health problems caused by the flare discharge of the circulating gas under the normal production and shutdown conditions of the device.
Description
technical field [0001] The invention relates to the technical field of coal chemical industry, in particular to a material recycling device and a method for producing ethylene glycol from synthesis gas. Background technique [0002] The existing two-step synthesis gas to ethylene glycol process usually contains a methyl nitrite (MN) synthesis unit and a dimethyl oxalate (DMO) synthesis unit. In the MN synthesis unit and the DMO synthesis unit, nitric oxide (NO) is recycled through the recycle gas. In the MN synthesis unit, NO is replaced by O 2 oxidized to NO 2 , NO 2 Reacts with NO to form N 2 O 3 , which can react with methanol in the recycle gas to generate MN and water, MN reacts with carbon monoxide (CO) in the DMO synthesis unit to generate DMO and NO, and the NO is recycled to the MN synthesis unit. [0003] The circulating gas contains N 2 , CO, CO 2 , NO and MN, where N 2 and CO 2 It is an inert component and needs to be continuously discharged to make N i...
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IPC IPC(8): B01D53/18B01D53/14C07C201/04C07C203/00C07C67/36C07C69/36
CPCB01D53/18B01D53/1487B01D53/1493B01D53/1456B01D53/1425B01D53/1418C07C201/04C07C67/36B01D2252/2021B01D2252/10B01D2257/404B01D2257/40C07C203/00C07C69/36Y02P20/52
Inventor 张子建姜兴剑徐伟伟黄从军张延斌冯永海
Owner CHINA SHENHUA COAL TO LIQUID & CHEM CO LTD