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Separation method and device for preparing methanol product through synthetic gas based on thermal high-pressure separation process

A technology for synthesis gas and methanol production, which is applied in the preparation of hydroxyl compounds, the preparation of organic compounds, chemical instruments and methods, etc., can solve the problems of large cooling load and energy waste, and achieves reduction of cooling load, energy consumption, and energy avoidance. wasteful effect

Active Publication Date: 2019-05-17
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above process, there are the following problems: (1) The temperature of the product coming out of the methanol reaction tower is relatively high, and it is directly cooled to about 40°C, and the cooling load is relatively large; (2) The original process directly depressurizes the methanol liquid phase, resulting in waste of energy

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  • Separation method and device for preparing methanol product through synthetic gas based on thermal high-pressure separation process

Examples

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Embodiment 1

[0025] This example takes 1.5 million tons / year coal-to-methanol as an example. Such as figure 1 As shown, a device for producing methanol products from syngas based on thermal high-resolution process, including methanol synthesis reactor inlet and outlet heat exchangers (1), methanol synthesis reactor (2), steam generator (3), water cooler (5, 11), hydraulic turbine (7, 9), high-pressure high-temperature tank (4), high-pressure low-temperature tank (6), low-pressure high-temperature tank (10), low-pressure low-temperature tank (8), circulating hydrogen compressor (12 );

[0026] Wherein, the feed syngas (13) is connected to the inlet of the inlet and outlet heat exchanger (1) of the methanol synthesis reactor, and the outlet of the inlet and outlet heat exchanger (1) of the methanol synthesis reactor is connected to the inlet of the methanol synthesis reactor (2), The outlet of the methanol synthesis reactor (2) is connected to the inlet of the steam generator (3), the outl...

Embodiment 2

[0044] This example takes 1.8 million tons / year coal-to-methanol as an example, and the synthesis gas composition is shown in Table 4. Specifically illustrate the method for separating methanol synthesis product, comprising the steps:

[0045] 1) Synthesis gas (13) with a pressure of 7 MPa and a temperature of 40° C. is preheated by the methanol synthesis reactor inlet and outlet heat exchanger (1) and then reacted in the methanol synthesis reactor (2);

[0046] 2) After the reaction product in the methanol synthesis reactor (2) exchanges heat with the steam generator (3) and the feed in turn, the temperature drops to 120°C, and produces 1.0MPa medium-pressure steam, which enters the high-pressure high-temperature tank (4) Carry out gas-liquid separation, the gas phase enters the high-pressure low-temperature tank (6) after being cooled to 85°C by the water cooler (5), further condenses and separates hydrogen and carbon monoxide, and the separated hydrogen and carbon monoxide ...

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Abstract

The invention provides a separation method and device for preparing a methanol product through synthetic gas based on a thermal high-pressure separation process. The method comprises the steps that areaction product of a methanol synthesis reactor firstly enters a medium-pressure steam generator and a methanol synthesis reactor feeding and discharging heat exchanger for heat exchange and cooling,gas-liquid separation is carried out in a high-pressure and high-temperature tank, a gas phase is subjected to heat exchange and cooling and then enters a high-pressure and low-temperature tank for further condensation and separation to obtain hydrogen and carbon monoxide for circulation, and a liquid phase is subjected to hydraulic turbine depressurization and then enters a low-pressure and low-temperature tank; and after the liquid phase in the high-pressure and high-temperature separation tank is subjected to depressurization and then enters a low-pressure and high-temperature tank for gas-liquid separation, the gas phase is cooled by a cooler and then enters the low-pressure and low-temperature tank, and the liquid phase is the methanol product. The separation method and device provided by the invention is suitable for gas-liquid separation for preparation of the methanol product through the synthetic gas, under the conditions that the purity of recycle hydrogen and carbon monoxide and the yield of methanol are not influenced, the product is prevented from being directly cooled to a low temperature, steam can be generated, the energy consumption of the subsequent flow is remarkably reduced through the thermal output, and the cooling load of a product separation part is remarkably reduced.

Description

technical field [0001] The invention belongs to the technical field of separation of methanol synthesis reaction products in the synthesis gas to methanol process, and in particular relates to a thermal high fraction separation method for methanol separation of methanol synthesis products. Background technique [0002] As a bulk chemical, methanol plays a particularly important role in the carbon-chemical industry. Especially with the successful development and application of the methanol-to-olefins process, the amount of methanol used is increasing. In the methanol synthesis process, the synthesis pressure is between 7 and 10 MPa, and the reaction temperature is between 210 and 280 ° C. At this time, the products after the reaction are all gaseous. In order to separate methanol, the current domestic methanol synthesis equipment is in production or In the design, the reaction product preheats the synthesis gas through a heat exchanger, then cools it to about 40°C through a ...

Claims

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Application Information

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IPC IPC(8): C07C29/152C07C31/04
Inventor 雷杨范中宇周宇航曹琳颜家保韩军
Owner WUHAN UNIV OF SCI & TECH