Process for producing sodium hydroxymethyl sulfonate by using byproduct formaldehyde and sodium sulfate

Abstract

The invention relates to the technical field of preparation of sodium hydroxymethyl sulfonate, and discloses a process for producing sodium hydroxymethyl sulfonate by using byproducts formaldehyde and sodium sulfate, which comprises the following steps: step 1, adding a toluene solution into a byproduct sodium sulfate solution to extract organic impurities; step 2, adding calcium hydroxide into the sodium sulfate solution subjected to impurity removal, and reacting to obtain sodium hydrogen sulfite; 3, filtering the reaction liquid in the step 2 to obtain a solid phase and filtrate, and drying the solid phase to obtain gypsum powder; 4, concentrating the filtrate to obtain a saturated sodium hydrogen sulfite solution; and 5, reacting the saturated sodium hydrogen sulfite solution with the byproduct formaldehyde solution to obtain the sodium hydroxymethyl sulfonate. According to the invention, the byproduct sodium sulfate is prepared into sodium hydrogen sulfite by using a simpler, more mature and brand-new production process, then the sodium hydrogen sulfite reacts with the byproduct formaldehyde, and the sodium hydroxymethyl sulfonate which is high in value, wide in applicability and large in market demand is prepared through deep processing, so that a new way for synthesizing the sodium hydroxymethyl sulfonate is provided, and the recycling of chemical byproducts is realized.

Description

technical field [0001] The invention relates to the technical field of preparation of sodium hydroxymethanesulfonate, in particular to a process for producing sodium hydroxymethanesulfonate by utilizing by-product formaldehyde and sodium sulfate. Background technique [0002] Sodium hydroxymethanesulfonate is used as an intermediate for sodium isoniazid sulfonate, neoarsinvaramine, carcinogen, etc. It is also used as a fixative for protein flavor, a floating lotion for lead-zinc ore and a color photo assistant ( Anti-pollution and fading) and cotton printing industry, the market demand is large, and the price is not cheap. At present, the existing processing method of sodium hydroxymethanesulfonate mainly utilizes the addition of formaldehyde and sodium bisulfite at 60 to 65°C. In addition, the depolymerization of paraformaldehyde in the chemical industry produces formaldehyde gas to participate in the reaction. Since it cannot be fully utilized, certain losses occur and th...

AI Technical Summary

Problems solved by technology

In addition, in the chemical industry, the formaldehyde gas produced by the depolymerization of paraformaldehyde participates in the reaction. Because it cannot be fully utilized, there is a certain loss and the production cost is high. At the same time, the formaldehyde gas is discharged through the tail gas, causing pollution to the environment and facing great environmental protection risks. , using the incineration law to invest a lot, it is unbearable for small enterprises

[0003] With the development of society, people have higher and higher requirements for environmental protection, and the sewage treatment must meet the discharge standards. However, the sulfuric acid or sodium sulfate exceeding the standard in the production wastewater has brought huge pressure to the sewage treatment, and even affected the normal production of the company.

There are many sources of sodium sulfate in the society, which has become a difficult problem to deal with, and even some sodium sulfate solids that cannot be processed normally have become new wastes, causing serious pollution to the environment

The current main destinations of sodium sulfate produced in the enterprise are as follows: 1. Dehydration to make sodium sulfate containing water, which is handed over to sodium sulfide manufacturers to make sodium sulfide, but the demand for sodium sulfide is limited and the value of sodium sulfide is not high

2. Concentration, crystallization, recrystallization, drying and dehydration to obtain anhydrous sodium sulfate as a dry reagent requires a lot of heat, extra manpower and equipment, and anhydrous sodium sulfate is cheap and difficult to promote in the market

3. Handed over to environmental protection enterprises as hazardous waste treatment, environmental protection enterprises can only be treated as hazardous waste through incineration and burial, but failed to cure, and there is still secondary pollution to the environment

4. There are a small number of enterprises that make sodium sulfate solution into sodium bisulfite, which can also produce certain benefits. However, the production equipment and production technology are not mature enough to produce on a large scale

Images