Low-temperature gas phase hydrolysis equipment for preparing white carbon black by using silicon tetrachloride

Abstract

The invention discloses low-temperature gas phase hydrolysis equipment for preparing white carbon black by using silicon tetrachloride. The low-temperature gas phase hydrolysis equipment comprises a feeding system, a gas carrier system, a gas phase hydrolysis system, a cyclone separation system, a primary deacidification system, a secondary deacidification system and a tertiary deacidification system. Silicon tetrachloride and pure water are continuously introduced according to a molar ratio of 1 : (4 to 8); uniform liquid drops are formed through an atomizing spray head and are vaporized after encountering high-temperature carrier gas, and reaction is carried out in a gas phase hydrolysis tower at 120 to 180 DEG C, so as to produce the white carbon black and hydrogen chloride gas; gas-solid separation of a mixed product is realized through the cyclone separation system, and then drying is performed for 4 hours at 160 DEG C to obtain a white carbon black product; a concentrated hydrochloric acid byproduct is recycled from hydrogen chloride mixed gas through the primary deacidification system and the secondary deacidification system; tail gas is subjected to treatment through the tertiary deacidification system so as to realize pollution-free emission. According to the low-temperature gas phase hydrolysis equipment disclosed by the invention, reaction energy consumption can be reduced, corrosion of the equipment is slowed, and the production cost is reduced; moreover, production capacity of the white carbon black of 100 to 200kg / d and the concentrated hydrochloric acid byproduct are achieved; the prepared white carbon black product is excellent in performance, and has wide production application prospects.

Description

technical field [0001] The invention belongs to the technical field of resource and material chemical industry, and in particular relates to a low-temperature gas-phase hydrolysis equipment for preparing white carbon black from silicon tetrachloride. Background technique [0002] Silicon tetrachloride (SiCl 4 ) is a by-product produced during the production of polysilicon in the photovoltaic industry. It is extremely corrosive and toxic, and was included in the "Inventory of Hazardous Chemicals (2012)". Silicon tetrachloride is highly irritating to human skin and respiratory tract, and is easily decomposed in the air to form hydrochloric acid mist. If it is discharged directly without treatment, it will seriously endanger human health and the ecological environment. Silicon tetrachloride is a hazardous chemical in the "National Hazardous Waste List (2008)" and must be disposed of in accordance with hazardous waste management regulations. Therefore, research on resource util...

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Problems solved by technology

[0005] In order to overcome the problems of high reaction energy consumption, high equipment requirements, high production cost and high dependence on foreign technology in my country for the preparation of gaseous white carbon black by hydrogen-oxygen combustion technology, the purpose of the present invention is to provide a kind of silicon tetrachloride to prepare white carbon black The low-temperature gas-phase hydrolysis equipment aims to realize the large-scale production of silica prepared by low-temperature gas-phase hydrolysis technology, partially replace gas-phase silica, and reduce the dependence on foreign imports

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