Production method of alkali amine industrial salt

Abstract

The invention discloses a production method of alkali amine industrial salt. The production process comprises a step of producing salt by virtue of a multi-effect vacuum evaporation system, wherein the multi-effect vacuum evaporation system comprises at least two evaporation tanks, and a brine input pipe is communicated to each evaporation tank. The production process is characterized by comprising an impurity removal step, wherein the impurity removal step comprises a pH value detection step and a pH value adjustment step; the pH value detection step comprises the procedure of sealing a fixed pH value sensor for measuring the pH value of liquid in the evaporation tank on each evaporation tank; and the pH value adjustment step comprises the procedure of sealing a fixedly-mounted water supply pipe for supplying water to the evaporation tank on each evaporation tank, wherein a control valve is fixedly mounted on the water supply pipe, and the pH value of the adjusted liquid in each evaporation tank is 7.5-8.5. The production method of the alkali amine industrial salt has the advantages that the implementation is convenient, the light transmittance of wet salt can be increased, and the content of sodium chloride in the wet salt can be increased; and the production method can meet the requirements of the alkali amine industrial salt.

Description

technical field [0001] The invention belongs to the field of salt making technology, and in particular relates to a production technology of alkali amine industrial salt. Background technique [0002] Salt is the raw material for the production of ammonia (use salt to produce hydrochloric acid, and then use hydrochloric acid to produce ammonia) and soda ash in the alkali amine industry, and ammonia and soda ash are chemical raw materials with large consumption. Therefore, the salt used in the alkali amine industry The demand is also relatively large (according to available data: in 2012, the total salt consumption in the country was 86.6 million tons, while the proportion of salt used in the alkali amine industry exceeded 80%, reaching 70.75 million tons). [0003] The process of making salt is to use brine as the raw material, which is evaporated and concentrated to precipitate NaCl, and then dehydrated and dried to become a qualified product. According to the content reco...

AI Technical Summary

Problems solved by technology

In multi-effect evaporation, as the number of effects increases, the consumption of unit steam decreases, which reduces the operating cost; on the other hand, the more the number of effects, the greater the investment cost of the device

Compared with the four-effect, the five-effect saves 10% of the raw steam, and the effect of increasing the number of effects is not obvious, and the cost of the device increases a lot. Therefore, the current domestic salt industry generally uses the five-effect vacuum evaporation system

[0005] The salt discharged by the existing "multi-effect vacuum evaporation production process" is separated by a centrifuge to obtain wet salt, but the prepared wet salt has low light transmittance (less than 60%) and low sodium chloride content ( less than 90%)

Images