Process for recycling sulfur-containing mixed waste gas in viscose production process
A viscose fiber, recycling and processing technology is applied in the field of recycling and processing sulfur-containing mixed waste gas in viscose fiber production, and recycling and processing sulfur-containing waste gas, achieving the effects of high market promotion value, low production cost, and reduced environmental protection pressure
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Embodiment 1
[0040] A process for recycling sulfur-containing mixed waste gas from viscose fiber production, comprising the following process steps:
[0041] A. Enrichment stage
[0042] Spray and absorb the sulfur-containing mixed waste gas produced in the viscose fiber production process with sodium hydroxide solution, absorb for 10 hours, and form a saturated absorption liquid, then add acid liquid to the saturated absorption liquid, stir while adding, the pH value is 4 Stop adding the acid solution at that time, and precipitate the enriched hydrogen sulfide gas;
[0043] B. Absorption stage
[0044] Dissolve lime nitrogen in water and stir to make lime nitrogen emulsion. Use lime nitrogen emulsion to spray and absorb the enriched hydrogen sulfide gas obtained in step A. Keep the temperature at 20°C during the spray absorption process. Stop absorption when the concentration of calcium hydrosulfide in the absorption solution reaches 10%;
[0045] C. Synthesis stage
[0046] Raise the...
Embodiment 2
[0048] A process for recycling sulfur-containing mixed waste gas from viscose fiber production, comprising the following process steps:
[0049] A. Enrichment stage
[0050] Spray and absorb the sulfur-containing mixed waste gas produced in the viscose fiber production process with sodium hydroxide solution, absorb for 20 hours to form a saturated absorption liquid, then add acid liquid to the saturated absorption liquid, stir while adding, the pH value is 8 Stop adding the acid solution at that time, and precipitate the enriched hydrogen sulfide gas;
[0051] B. Absorption stage
[0052] Lime nitrogen is dissolved in water and stirred to form a lime nitrogen emulsion, and the enriched hydrogen sulfide gas obtained in step A is sprayed and absorbed by the lime nitrogen emulsion, and the temperature is kept at 50°C during the spray absorption process. Stop absorption after the concentration of calcium hydrosulfide in the absorption solution reaches 17%;
[0053] C. Synthesis...
Embodiment 3
[0056] A process for recycling sulfur-containing mixed waste gas from viscose fiber production, comprising the following process steps:
[0057] A. Enrichment stage
[0058] Spray and absorb the sulfur-containing mixed waste gas produced in the viscose fiber production process with sodium hydroxide solution, absorb for 15 hours to form a saturated absorption liquid, then add acid liquid to the saturated absorption liquid, stir while adding, the pH value is 6 Stop adding the acid solution at that time, and precipitate the enriched hydrogen sulfide gas;
[0059] B. Absorption stage
[0060] Dissolve lime nitrogen in water and stir to make lime nitrogen emulsion. Use lime nitrogen emulsion to spray and absorb the enriched hydrogen sulfide gas obtained in step A. During the spray absorption process, keep the temperature at 35°C. Stop absorption when the concentration of calcium hydrosulfide in the absorption solution reaches 13.5%;
[0061] C. Synthesis stage
[0062] Raise th...
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