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Device and method for preparing sulfite

A technology of sulfite and sodium sulfite, applied in the chemical industry, can solve the problems of high gas phase pressure loss, declining profit margin, high comprehensive energy consumption per unit of product, etc., and achieve the effect of small gas phase pressure loss and low production cost

Active Publication Date: 2019-09-20
NANJING UNIV OF TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the cost of obtaining sulfur is lower than that of the sulfur method, the industrial added value of the by-product iron red and steam is higher, and the product profit is better than that of the sulfur method, but the content of arsenic, iron and heavy metals in the product is not easy to control, and it is difficult to maintain long-term stability Meet the technical preparation of food-grade products
In addition, the product adopts the drying technology of hot air as the drying medium, coupled with the three-stage bubbling tank reactor, resulting in high pressure loss in the gas phase and high comprehensive energy consumption per unit of product
And because of the large output of waste water and the high investment cost of environmental protection, the profit margin is also falling sharply

Method used

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  • Device and method for preparing sulfite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] ①. Preparation of the main absorption liquid: when the device is running for the first time or after overhaul, use desalted water and soda ash in a concentrated alkali tank to prepare a thick slurry with a temperature of 45-57°C and a relative density of 1.28-1.35; after normal production, Using the mother liquor of saturated sodium bisulfite as a solvent and soda ash as a solute, prepare a thick slurry with a temperature of 42-57°C and a relative density of 1.45-1.55 in a concentrated alkali tank;

[0053] ②. Preparation of auxiliary absorption liquid: use desalted water and condensed water condensed from the drying system to dissolve soda ash, and prepare dilute alkali solution with a temperature of 42-57°C and a relative density of 1.25-1.33 in a dilute alkali tank;

[0054] ③. Generation of intermediate slurry: transfer the prepared slurry in step ① to the first stage reactor of the tower reactor through the concentrated alkali pump, and carry out countercurrent cont...

Embodiment 2

[0060] ①. The preparation of the main absorption liquid: with example 1.

[0061] ②. Preparation of auxiliary absorption liquid: same as Example 1.

[0062] ③. Generation of intermediate slurry: transfer the slurry prepared in step ① to the first stage of the tower reactor through the concentrated alkali pump, and mix with SO 2 The raw material gas is subjected to a countercurrent contact reaction to generate an intermediate slurry of sodium sulfite and sodium bisulfite;

[0063] ④. Residual SO 2 Gas reabsorption: transfer the dilute slurry prepared in step ② to the second-stage reactor of the tower reactor through the dilute alkali pump, react with the residual gas from the first-stage reactor (51), and transfer the first-stage reaction After the reactor (51) the SO in the residual gas The volume concentration drops below 0.1%. After the pH value of the absorption liquid in the second stage reactor 61 drops to 6.8~7.8, it is transferred to the mother liquor tank 24 by the s...

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Abstract

The invention relates to a device and method for preparing sulfite, belonging to the field of chemical industry. The method comprises the following steps of preparation of main absorption liquid, preparation of auxiliary absorption liquid, generation of intermediate slurry, reabsorption of residual SO2 gas, generation of a target product, separation of the target product, drying and packaging. In the production process of conventional sodium pyrosulfite or sodium sulfite, SO2 and sodium carbonate react in three-stage bubbling reaction kettles which are cascaded with each other. The power consumption of a unit product is as high as 235-280KWh; in the process of the application (the preparation of the sodium pyrosulfite or sodium sulfate), only a one-stage bubbling reaction kettle is used, the loss of pressure of gas is small, the energy consumption is low, and in general, the power consumption of the unit product is 135-160KWh.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a device and method for preparing sulfite. Background technique [0002] With the advancement of environmental protection technology, the flue gas desulfurization technology of recovery method has been developed rapidly. In the past, the supply and demand of the sulfuric acid industry was tight, and the SO by-product of desulfurization 2 The gas is mainly used to make sulfuric acid, an industry that today suffers from overcapacity and little profit. Such as active coke desulfurization process, organic amine desulfurization process, citric acid desulfurization process and other desulfurization technology absorbent regeneration process all by-product high concentration SO 2 Regeneration gas, if this kind of sulfur-containing gas is continued to be used for the production of sulfuric acid, it is economically unacceptable. Based on the economic purpose as the final result orientat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/14
CPCC01D5/145C01D5/14
Inventor 徐海涛徐延忠李明波陈任远刘大华李军民吴振山宋静
Owner NANJING UNIV OF TECH
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