Technique method for producing sodium bisulfide

Abstract

The invention discloses a technique method for producing sodium bisulfide and belongs to the technical field of the chemical engineering production technology. The technique method for producing sodium bisulfide is low in production cost and can control product quality easily during production. The technique method includes: feeding buffered hydrogen sulfide and process absorption liquid with sodium sulphide as the main ingredient into an absorption tower respectively from the lower portion and the upper portion of the absorption tower, absorbing the hydrogen sulfide and the process absorption liquid on the surface of packing in the absorption tower to generate solution with the sodium bisulfide as the main ingredient, enabling the solution to flow to the bottom of the absorption tower, and discharging the unabsorbed hydrogen sulfide tail gas from the top of the absorption tower; pumping the solution at the bottom of the absorption tower out, returning most of the solution back to the absorption tower for recycling, feeding the small amount of solution to a sodium bisulfide production solution storing tank, and simultaneously adding the process absorption liquid in the absorption tower from the upper portion of the absorption tower during the absorption circulating process; and finally performing evaporation, concentration and dehydration on the solution, cooling the solution for molding, packaging and finishing the production of the sodium bisulfide.

Description

technical field [0001] The invention relates to a process method for producing sodium hydrosulfide, which belongs to the technical field of chemical production process. Background technique [0002] Traditional sodium hydrosulfide production technique is batch method, and the production device of described batch method production technique is made up of equipment such as two or more absorption reactors, vacuum pump, lye feed pump, sodium hydrosulfide solution extraction pump, and absorption liquid is sodium hydroxide solution. In specific production, the production process is as follows. First, add a set amount of sodium hydroxide solution to an absorption reactor, close the relevant valves, start the agitator for stirring, and start the vacuum pump to vacuum; when the vacuum degree reaches the set value The hydrogen sulfide gas is fed into the reactor at the same time, and reacts under stirring; when the reaction reaches the last stage, in order to ensure that the reaction...

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Problems solved by technology

[0004] 1. The power consumption is relatively high. The main reason is that firstly, in order to ensure the uniform absorption reaction of hydrogen sulfide and sodium hydroxide in the reactor, the absorption liquid is stirred during the whole absorption process; secondly, hydrogen sulfide is a highly toxic gas. Accidents, causing personnel poisoning and death, so it needs to be carried out under vacuum conditions

The use of stirring and vacuum pumps leads to high power consumption and high cost of the product

[0005] 2. The product quality is not well controlled. Due to the influence of various factors such as hydrogen sulfide gas flow rate change, ambient temperature, stirring speed, vacuum pump, etc., the reaction end point is not easy to control. The reaction product often has excessive sodium sulfide content and needs supplementary absorption.

[0006] 3. It is difficult to realize automatic operation, the number of operators is large, and the waste of labor is serious

Due to many operating steps, frequent start and stop of equipment, and many control points, it is difficult to realize programmed automatic operation. Basically, each step requires human operation.

[0007] 4. Valves, mixing, and pumps are frequently operated, resulting in a high failure rate of equipment and heavy maintenance tasks

[0008] 5. Environmental odor, whether the reactor adopts single or multiple cascaded absorption, hydrogen sulfide cannot be completely absorbed, and the hydrogen sulfide content in the absorption tail gas is relatively high, resulting in odor in the working environment

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