Crystallization method through gas-liquid biphasic reaction and apparatus thereof

Abstract

A crystallization method through gas-liquid biphasic reaction is disclosed. Liquid materials react with gas phase materials to produce solid phase crystals. The method includes the following steps that: in a low temperature crystallizer, liquid materials and gas phase materials are subjected to chemical reactions so as to realize generation and growth of crystal nucleuses, wherein the chemical reaction process is a biphasic continuous reaction process that comprises a chemical reaction process of which the liquid materials are continuous phase and the gas phase materials are dispersed phase and a chemical reaction process of which the gas phase materials are continuous phase and the liquid materials are dispersed phase; then in a high temperature crystallizer, a reaction process of using a liquid phase as a continuous phase and a gas phase as a dispersed phase on the crystal nucleuses is performed so as to crystallize and make the crystal nucleuses become bigger; a high temperature crystal plasma separator is used to obtain solid phase crystallized products. The crystal nucleuses can be automatically returned in a crystal nucleus system so that formation and quantity of the crystal nucleuses can be controlled. The grown crystals are taken out in a high temperature area of an apparatus and the crystal nucleuses are formed in a low temperature area of the apparatus. The processes of generation and growth of the crystal nucleuses are performed in different containers of a gas-liquid biphasic response apparatus provided in the invention.

Description

Technical field [0001] The invention belongs to the field of inorganic chemical industry, and specifically relates to a gas-liquid two-phase reaction crystallization method and a device. The gas-liquid two-phase reaction refers to a chemical reaction that can produce solid crystals. The reaction device involved in the present invention is a reaction device that uses gas and liquid phases as reactants to produce a solid-phase crystalline product as a specific reaction type. The reaction device is mainly used in inorganic chemical fields such as the alkali industry. This kind of reaction device not only solves the problem of gas and liquid two-phase reaction control, but more importantly, solves the problem of crystallization of solid phase products. Background technique [0002] With people's research on chemical products such as soda ash, it has been discovered that many chemical products have crystal forms that are similar to metals and have specific crystal structures, which a...

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Problems solved by technology

[0006] 2. The crystallization process lacks control measures

[0018] As we all know, NaHCO 3 The production and growth of grains require different supersaturations. In the manufacturing process of soda ash, due to the influence of NaHCO 3 The structural characteristics of the crystal itself, the lack of control of various parameters in the manufacturing process and other factors lead to low quality of the final product and increase the cost of subsequent processing

For example, during the carbonation of ammonia brine, NaHCO 3 The production (or called nucleation) and growth process of crystal grains are carried out in the same chamber, and the supersaturation of the solution is difficult to control. If the temperature is higher, the number of crystal nuclei formed is less (in this case, the grain length Larger and faster), the product yield is lower, resulting in an increase in cost; if the temperature is lower, the number of crystal nuclei will increase, and the crystal growth will be slow, resulting in finer particles of soda ash produced, which may or cause the crystal size to be unsatisfactory and prolong the production process. The crystallization growth cycle will reduce the production capacity of the production device

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