A process for synthesizing ethanol with a heat exchanger

Abstract

The invention relates to a heat exchange unit ethanol synthesis process. The heat exchange unit ethanol synthesis process includes the following steps that step 1, a raw material gas mixture enters a third heat exchanger, a second heat exchanger and a first heat exchanger through a pipe in turn; step 2, the raw material gas mixture passes through a pipe to enter a reactor from the bottom to be fed into the top of the reactor through a straight branch pipe to be discharged and a catalytic hydrogenation reaction is performed in the reactor; step 3, the mixture after the catalytic hydrogenation reaction enters the first heat exchanger, the second heat exchanger and the third heat exchanger through the pipe from the bottom in turn. According to the heat exchange unit ethanol synthesis process, the heat recovery utilization rate is high, the pipes and the devices are connected with each other in a direct welding mode, and accordingly the problems of the pipe thermal stress and the system flange sealing are solved so as to solve the problems of the process for preparing ethanol through acetic acid and hydrogenation.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a process for synthesizing ethanol with a heat exchanger. Background technique [0002] Heat exchangers are the most common and even essential equipment in chemical plants. According to its arrangement, it can be divided into horizontal heat exchanger and vertical heat exchanger, according to its use, it can be divided into condenser, cooler, heater (reboiler), heat exchanger, etc., and according to its structure, it can be divided into tube There are three types of shell heat exchangers, casing heat exchangers and plate heat exchangers. The former is divided into fixed tube plate type, U-shaped tube type, floating head type, kettle type heat exchanger, etc. Devices can be divided into single-tube and multi-tube. It can be said that there are various forms and types. [0003] At present, in the chemical production process, the conventional heat exchanger body and pipeline ...

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Problems solved by technology

[0006] The heat exchanger connection and heat recovery mentioned above can meet the design and production operation requirements in the conventional petrochemical production process, but there are three problems in the high-temperature, high-pressure, flammable and explosive production environment: The first is: The heat recovery efficiency is not good; the second is: the pipeline is connected by flange connection, and in the process of heating and cooling, leakage, combustion and explosion are prone to occur at the flange connection position; the third is: the production is in the process of heating and cooling Thermal deformation is easy to damage equipment and pipelines; the fourth is: the expansion joint used for buffering is easy to break

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