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

Abstract

The invention discloses a method for obtaining fine methanol products by using methanol to olefins (MTO) methanol products. The key is as follows: a fine methanol rectifying tower is added in a three-tower distillation process of producing MTO-grade methanol products, so as to obtain the fine methanol products and meet the requirements of downstream products on the fine methanol. The method comprises the following concrete steps: separating out a part of MTO-grade methanol products from the top of an MTO methanol pressure tower; and feeding to the fine methanol rectifying tower, thereby obtaining the fine methanol products from the top of the fine methanol rectifying tower in a rectifying manner and returning the tower bottom liquid of the fine methanol rectifying tower back to an MTO methanol atmospheric tower. The fine methanol products are obtained under the condition that a few of equipment are added by the steps, and production of the original MOT-grade methanol products is not affected, so that the target of saving investments is 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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