Method for obtaining fine methanol products by using methanol to olefins (MTO) methanol products

Abstract

The invention discloses a method for obtaining refined methanol products by using MTO methanol products, which mainly refers to adding a refined methanol rectification tower in the three-tower rectification process for producing MTO grade methanol products, so as to obtain refined methanol products, satisfying Demand for refined methanol in downstream products. The specific method is: separate a part of the MTO grade methanol product from the top of the MTO methanol pressurization tower, and send it to a refined methanol rectification tower, and obtain the refined methanol product at the top of the refined methanol rectification tower through rectification, while the refined methanol The bottom liquid of the distillation column is returned to the MTO methanol atmospheric column. Through the above steps, the refined methanol product can be obtained with few additional equipment without affecting the production of the original MTO grade methanol product, and the purpose of saving investment can be achieved.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to the technical field of methanol preparation and purification. Background technique [0002] With the development of the methanol-to-olefins (MTO) process, the number of domestic MTO methanol plants has increased. Due to the low concentration of MTO methanol (its volume concentration is generally lower than 95%), when refined methanol is required, the MTO methanol plant cannot meet the requirements, and MTO methanol needs to be purified, and if a new set of refined methanol plant is built, it will occupy an area And equipment investment, also need to increase supporting public works. Moreover, to obtain refined methanol by rectification on the basis of finished MTO methanol, it is necessary to pressurize and pump the MTO methanol and reheat it from normal temperature, which consumes a lot of energy and costs too much. Contents of the invention [0003] The purpose ...

AI Technical Summary

Problems solved by technology

Due to the low concentration of MTO methanol (its volume concentration is generally lower than 95%), when refined methanol is required, the MTO methanol plant cannot meet the requirements, and MTO methanol needs to be purified, and if a new set of refined methanol plant is built, it will occupy an area and equipment investment, but also need to increase supporting public works

Moreover, to obtain refined methanol by rectification on the basis of the finished MTO methanol, it is necessary to pump the MTO methanol under pressure and reheat it from normal temperature, which consumes a lot of energy and costs too much.

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