A method for fully utilizing sodium chloride waste residue salt for resource utilization by a polymerization carbonization method

Abstract

The invention discloses a method for recycling all-utilizing sodium chloride waste residue salt by polymerization carbonization. The method comprises the following steps: (1) adding a polymerization catalyst to the sodium chloride waste residue salt, calcining the reacted waste salt and then cooling the material to room temperature, adding the water to a solid obtained after cooling, stirring thematerial to dissolve the material completely, then filtering the material, and drying and recovering the filtered carbon material; (2) taking the filtrate obtained by the step (1) after filtration, adding sodium carbonate while stirring, and after addition, performing standing and filtering the material, and drying and recovering the filtered filter residue; and (3) adding hydrochloric acid to a solution obtained by the step (2), performing standing and heating the material, performing separating and heating on the precipitated crystals, and drying the material. The method has the advantages of simple process, low cost and thorough purification, and can obtain three products of a carbon material, calcium carbonate and sodium chloride, and the utilization of total waste salt is realized.

Description

technical field [0001] The invention belongs to the field of purification and recovery of industrial waste residue salt, and in particular relates to a method for fully utilizing sodium chloride waste residue salt for resource utilization through a polymerization carbonization method. [0002] technical background [0003] Trimethyl orthoformate (also known as trimethoxymethane, referred to as methyl orthoformate, is an important intermediate in organic synthesis, used for vitamin B in the pharmaceutical industry 1 , vitamin A, sulfadiazine, pipemidic acid and antibacterial agents, among which vitamin B 1 The largest proportion of methyl orthoformate is consumed. Also used in the dye and fragrance industries. Trimethyl orthoformate is obtained by reacting chloroform and methanol in the presence of caustic soda (or chloroform and sodium methoxide). Add 280 kg of chloroform to the dropping device, control the temperature at 68-73° C., and add chloroform dropwise while stirri...

AI Technical Summary

Problems solved by technology

This disposal method is expensive, not only occupies a large amount of land, but also has the risk of secondary environmental damage caused by external factors such as geological disasters

[0005] At present, although most people focus on the research on the synthesis and preparation of trimethyl orthoformate, the research on its process waste salt comprehensive recovery treatment method is relatively small, and most of the technologies have the following defects: (1) organic matter is difficult to obtain. Sufficient removal; (2) The carbonized particles of organic matter are too small to be removed by simple dissolution and filtration

Therefore, many waste salts produced during the synthesis of trimethyl orthoformate have not been effectively treated, resulting in a waste of a large amount of recyclable resources.