Spiral plate type vinyl chloride synthetic converter

Abstract

The invention discloses a spiral plate type vinyl chloride synthetic converter. The converter comprises a vertical barrel-shaped shell as well as a first heat exchange plate and a second heat exchange plate which are double-spirally wound in the shell, wherein openings are formed at the two ends of the shell; a first channel and a second channel, which are double-spirally arranged, are formed between the first heat exchange plate and the second heat exchange plate; the upper and lower sides of the first channel are closed; a first opening is formed in the center of a spiral of the first channel and a second opening is formed in the edge of the spiral of the first channel; the center and edge of a spiral of the second channel are closed; the upper and lower sides of the second channel are open to form a third opening and a fourth opening; a catalyst is arranged on the side wall of the second channel. The converter has the advantages that as the spiral plate type structure is adopted, the structure size is reduced and the conversion rate is increased; due to a self-cleaning function of the spiral plate type structure, hot water scales are reduced, so that the service life and the repair cycle are prolonged and corrosion and leakage of pipelines are avoided; the vinyl chloride production technology level can be greatly improved; the market demands can be met.

Description

technical field [0001] The invention relates to vinyl chloride production equipment, in particular to a spiral plate type vinyl chloride synthesis converter. Background technique [0002] Vinyl chloride is an important monomer used in polymer chemical industry. It is colorless, easy to liquefy, explosive and toxic. At present, vinyl chloride is generally produced by the calcium carbide method, mainly using a fixed tube plate and tubular reactor structure. The production principle is that the mixed gas coming out of the mixer enters the converter with mercuric chloride as the catalyst for reaction. , to convert acetylene and hydrogen chloride into vinyl chloride. The reaction is a strong exothermic reaction, and the central temperature of the reaction zone can reach up to about 190°C. A large amount of heat released by the reaction must be removed by the shell-side circulating water cooling medium. The vinyl chloride synthesis converter is actually a large heat exchanger, ...

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Problems solved by technology

However, there are some defects in this result. Because the heat exchange tubes and tube sheets are formed by expansion joints, the technical requirements for expansion joints are very strict. As long as there is a small amount of leakage from the tube head, the cooling medium in the shell side will be Leakage into the tube side makes the dry hydrogen chloride gas in the tube side generate hydrochloric acid, and rapidly corrodes until a large amount of hydrochloric acid is discharged from the acid outlet at the bottom, resulting in a safety shutdown accident

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