Method for producing sodium sulfide of low-sulfur sodium hydride
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A sodium hydrosulfide and production method technology, applied in the direction of alkali metal sulfide/polysulfide, etc., can solve problems such as unreachable content and difficult control of sulfur content
Active Publication Date: 2018-12-07
ZHUSHAN COUNTY QINBA BARIUMSALT CO LTD
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It is necessary to remove the sodium hydrosulfide in the caustic soda to provide the selectivity of the reaction, but in the prior art, the removal of the sulfur content is difficult to control and cannot reach the required content
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[0048] 1.2. The removal amount of sodium hydrosulfide is 3.7%, so the sodium hydrosulfide to be removed is 5000 / (300×24)×3.7%=25.7Kg / h, and sodium hydroxide 25.7×40 / 56=18.4Kg / h is required h (value 19.2Kg / h) prepares sodium hydroxide solution concentration to be 30%, solution amount 18.4 / 0.3=61.3Kg / h (value 64Kg / h). The amount of 10% barium sulfide in coprecipitant is 1.5L / h.
[0049] 2. Determine the size of the spiral mixing tube
[0050] 2.1. The spiral mixing tube is made of 65mm cylinder diameter and 316L stainless steel pipe. The diameter of the spiral blade is 45mm, the length is 900mm, the pitch is 100mm, the central axis is 15mm, the throat diameter of the Venturi shrinkage tube is 20mm, the length of the contraction section is 80mm, and the length of the diffusion section is 120mm;
[0051] 2.2. The diameter of the sodium hydroxide feed pipe is 15mm, the diameter o...
[0057] 1.2 The removal amount of sodium hydrosulfide is 3.2%. Therefore, the sodium hydrosulfide that needs to be removed is 10000 / (300×24)×3.2%=44.5Kg / h. Need sodium hydroxide 44.5 * 40 / 56=31.8Kg / h (taking value 33Kg / h) preparation sodium hydroxide solution concentration is 30%, solution amount 33 / 0.3=110Kg / h. The amount of 10% barium sulfide in coprecipitant is 2.5L / h;
[0058] 2. Determine the size of the spiral mixing tube
[0059] 2.1. The spiral mixing tube is made of 80mm cylinder diameter and 316L stainless steel pipe. The diameter of the spiral blade is 60mm, the length is 1100mm, the pitch is 120mm, the central axis is 20mm, the throat diameter of the Venturi shrinkage tube is 25mm, the length of the contraction section is 100, and the length of the diffusion section is 150.
[0060] 2.2. The diameter of the sodium hydroxide feed pipe is 20mm, the diameter of the...
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Abstract
The invention relates to a method for producing sodium sulfide of low-sulfur sodium hydride. The method comprises the following steps: S1) dissolving a certain amount of inorganic base and water in astirring tank, thus obtaining an inorganic base solution with a concentration of 350-400g / L; S2) selecting a certain amount of sodium sulfide alkali liquor, concentrating into a sodium sulfide solution with a concentration of 20%, adding the inorganic base solution acquired in the step S1 and a co-precipitator with concentration of 90-100g / L, respectively adding into three inlet channels in a three-channel mixer, and mixing and uniformly stirring at 60-70 DEG C; S3) introducing a mixed solution acquired in the step S2 from an outlet of the three-channel mixer into a settling tank, settling andseparating precipitate, and settling for 3-5h, thus obtaining supernatant liquor and a bottom precipitate. According to the invention, a three-way pipe with Venturi tube and spiral mixing pipe is arranged for mixing the raw materials, and meanwhile, the concentration and dosage of the raw materials are controlled so as to obtain the reaction power of complete reaction and the sodium sulfide of low-sulfur sodium hydride; the method is simple and convenient; the method can realize mass production.
Description
technical field [0001] The invention relates to the field of soda sulfide production, in particular to a method for producing soda sulfide with low sodium hydrosulfide. Background technique [0002] Sodium sulfide (sodium sulfide) in the production of vulcanized rubber, when the content of sodium hydrosulfide is high, it is easy to generate trisulfide, and the content of disulfide is insufficient. It is necessary to remove the sodium hydrosulfide in the caustic soda to provide the selectivity of the reaction, but in the prior art, the removal of the sulfur content is difficult to control and cannot reach the required content. Contents of the invention [0003] The objective of the invention is in order to overcome the deficiencies in the prior art, obtain a kind of soda sulfide production method of low sodium hydrosulfide. [0004] The present invention is realized through the following technical solutions: [0005] A method for producing soda sulfide with low sodium hyd...
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