Device and method for removing terephthalic acid granules from methacrylic acid reaction gas

Abstract

The invention discloses a device for removing terephthalic acid (PTA) granules from methacrylic acid reaction gas. The device comprises the following parts of: a reaction gas intake pipe (1), a reaction gas exhaust pipe (2), a washer (3), a buffer tank (4), a circulating pump (5) and a liquid supplementation pipeline (6), wherein the upper end of the washer (3) is connected with the reaction gas intake pipe (1); one end of the washer (3) is inserted into the internal part of the buffer tank (4); the inlet of the circulating pump (5) is connected with the bottom of the buffer tank (4), and the outlet of the circulating pump is connected with the middle part of the washer; the liquid supplementation pipeline (6) is connected with the middle part of the buffer kettle (4); and the washer (3) is composed of three parts of a reduced section (7), a straight pipe section (8) and an expanded section (9).

Description

technical field [0001] The invention relates to a device for removing terephthalic acid (PTA) particles in methacrylic acid reaction gas. More specifically, the reaction gas generated from the oxidation of isobutene (tert-butanol) to methacrylic acid can effectively remove the reaction by-product terephthalic acid (PTA) after passing through the device, so that the reaction gas can be purified. Background technique [0002] Methacrylic acid is an important organic chemical raw material and an intermediate of polymers. The plexiglass produced by its most important derivative product, methyl methacrylate, can be used in windows of aircraft and civil buildings, and can also be processed into buttons, solar filters, etc. Optical mirrors, automotive lamp lenses and liquid crystal displays, etc.; the coatings produced have superior suspension, rheological and durable properties; the adhesives made can be used for bonding metals, leather, plastics and building materials; methacryla...

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Problems solved by technology

This part of terephthalic acid (PTA) enters the absorption tower together with the reaction gas, and after mixing with the aqueous solution of methacrylic acid, it is slightly viscous, which is very easy to block equipment and pipelines, and reduce the start-up cycle of the device; in addition, due to terephthalic acid The particle size of (PTA) is very small, and it will enter the cycle gas compressor with the cycle gas, causing damage to the cycle gas compressor. In the medium application, the combination of water washing and filtration is mainly used to remove terephthalic acid (PTA), but the efficiency of water washing to remove terephthalic acid (PTA) is not high, and the trays in the water washing tower are easy to block, so it is necessary to clean the tower frequently and filter The resistance drop of the method is large, and the energy consumption is high

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