Methanol wax removal film separator and method for methanol wax removal

Abstract

The invention discloses a methanol wax removal film separator and a method for methanol wax removal. A polar selective permeable film is mounted on the novel methanol wax removal film separator and prepared from polyacrylic acid and 1, 3-propanediol. The film is applied into the methanol wax removal film separator, polar small molecule substances such as methanol can selectively penetrate, productmethanol side-reaction product wax substances in methanol synthesis can be separated, methanol quality is improved, production energy consumption is reduced, and the problem of blocking of a pipelinecaused by wax precipitation is effectively prevented. A film preparation process is simple, selected materials are low in price, and the film has high selectivity, large flux and great development potential.

Description

technical field [0001] The present invention relates to a methanol wax removal membrane separator, also relates to a polar selective permeation membrane, and a method for methanol wax removal using the separator technical background [0002] In the process of industrial synthesis of crude methanol, the use of catalysts and the service life of catalysts are different, and long-chain alkanes and paraffins can be found in crude methanol. Especially in the middle and late stages of catalyst use, the content of paraffin wax increases significantly. During the cooling and recovery process of gas-phase methanol, paraffin substances will precipitate, block the heat exchanger and corresponding pipelines, and the system will be forced to drop the load or shut down for treatment, seriously affecting the quality of methanol and the safe operation of the system. [0003] Existing methanol wax removal technologies include: (1) Parking and boiling wax: During the methanol production proce...

AI Technical Summary

Problems solved by technology

During the cooling and recovery process of gas-phase methanol, paraffin substances will precipitate, block the heat exchanger and corresponding pipelines, and the system will be forced to drop the load or shut down for treatment, seriously affecting the quality of methanol and the safe operation of the system

[0003] Existing methanol wax removal technologies include: (1) Parking and boiling wax: During the methanol production process, parking and boiling wax are used, which limits production and requires more than 8 hours for the treatment process. The heating process will cause the pipeline to be heated unevenly. System wax removal is not complete

(2) On-line wax cooking: On-line wax cooking relies on the process gas of the system to directly heat the corresponding pipeline. The wax removal effect is obvious, but the paraffin will be brought into the separator, resulting in poor separation effect and serious wax deposition in the separator.

[0004] Patent CN201020600389.0 adopts multi-stage mechanical cyclone separation combined with wire mesh defoaming, completely through physical collision interception, the effect of paraffin removal is not ideal, paraffin is enriched at the bottom of the tank, and heating is required to melt the wax, which cannot fully meet the needs of industrial production

[0005] Patent CN200420086161.9 filters the paraffin through a precision separation / filtration device, but the paraffin will block the filter membrane, resulting in frequent cleaning, and the filter membrane has high price, long service life, high operating cost and low cost performance

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