Method of refining synthetic methanol with heat integration

Abstract

The invention discloses a finishing method to synthesize carbinol, which is characterized by the following: rectifying rough carbinol in the pre-tower; adding extracting water from the top of pre-tower; discharging light component from the top of pre-tower; entering rought carbinol into middle part of pressurizing tower to rectify; making residual rough carbinol into middle part of normal pressure tower to rectify; draining waste water from the bottom of tower; dividing the steam of pressurizing tower into two parts to transmit into reboiler on the bottom of pre-tower and reboiler on the bottom of normal pressure tower as heat providing dielectric.

Description

technical field [0001] The invention relates to a method for refining synthetic methanol with heat integration. It belongs to resource and energy saving chemical production technology. Background technique [0002] Methanol is an important organic chemical raw material and new energy fuel, and has a wide range of uses in the fields of chemical industry, light industry and clean energy. In the industrial production process of synthetic methanol, the refining of crude methanol is not only an important process that determines the quality of methanol products, but also the energy consumption of the refining process is one of the key factors affecting the production cost of methanol. Therefore, under the condition of ensuring the quality of methanol products, it is of great significance to save energy and reduce consumption in the methanol refining process. At present, the energy-saving refining process that has been widely used in the synthetic methanol industry is the three-t...

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Problems solved by technology

[0003] Through analysis and research, we found that the common three-tower process also has the following disadvantages: 1) Since the concentration of methanol discharged from the bottom of the pressurized tower is lower than that of the feed methanol, the separation degree of the atmospheric column is lower than that of the atmospheric column in the two-tower process. The degree of separation is high, and the reflux ratio required to achieve the same product purity is larger, thereby causing an increase in the unit consumption of steam in the atmospheric tower; The generated salt and excess alkali are brought into the atmospheric tower, resulting in the discharge of the atmospheric tower containing saline and alkali components, which can only be sent to sewage treatment

3) The process only considers the heat integration of the pressurized tower and the atmospheric tower, and the heat required by the pre-tower accounts for about one-third of the total heat of the system, which is completely supplied by raw steam

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