Process of producing vat powder with recovered SO2 tail gas washing liquid
A sulfur dioxide and tail gas scrubbing technology, which is applied in the direction of thiosulfate/dithionite/polythionate, etc., can solve the problems of low yield of raw materials and products, large amount of wastewater treatment, and high cost, and achieve Save equipment investment, improve conversion rate, and simplify operation
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example 1
[0057] Prepare three raw materials A, B, and C respectively. The preparation of raw material A is as follows: 250 parts of 98% sodium formate are added to methanol aqueous solution containing 680 parts of methanol and 230 parts of water. The methanol aqueous solution is prepared from the mother liquor of sodium hydrosulfite and water. The preparation of raw material B is as follows: 240 parts of 98% sodium metabisulfite are added to 8 parts of methyl formate, 160 parts of methanol, SO 2 -in methanol solution. The raw material C was prepared as follows: 120 parts of sulfur dioxide was added to methanol containing 8 parts of methyl formate and 160 parts of methanol.
[0058] 20 parts of raw material A are added into the reactor as the first batch of material, and the material is at a gauge pressure of 2kg / cm 2 After heating to 81°C with stirring, 50 parts of raw material C were added. Then according to the third step, the suspension of sodium formate, sodium pyrosulfite or s...
example 2
[0061] Prepare three raw materials A, B, and C respectively. The preparation of raw material A is as follows: 250 parts of 98% sodium formate are added to methanol aqueous solution containing 680 parts of methanol and 230 parts of water. The methanol aqueous solution is prepared by using the mother liquor of sodium hydrosulfite and sulfur dioxide methanol absorption tail gas washing liquid. The preparation of raw material B is as follows: add 230 parts of 98% sodium metabisulfite to 8 parts of methyl formate, 160 parts of methanol, SO 2 -in methanol solution. The raw material C was prepared as follows: 120 parts of sulfur dioxide was added to methanol containing 8 parts of methyl formate and 160 parts of methanol.
[0062] The reaction conditions, the method of addition and the overall reaction time are exactly the same as those described in Example 1. After filtering, washing and drying, 513 parts by weight of sodium hydrosulfite product were obtained, with a content of 91...
example 3
[0064] Prepare three raw materials A, B, and C respectively. The preparation of raw material A is as follows: 250 parts of 98% sodium formate are added to methanol aqueous solution containing 680 parts of methanol and 230 parts of water. The methanol aqueous solution is prepared by using the mother liquor of sodium hydrosulfite and sulfur dioxide methanol absorption tail gas washing liquid. The preparation of raw material B is as follows: add 230 parts of 98% sodium metabisulfite to 8 parts of methyl formate, 160 parts of methanol, SO 2 -in methanol solution. The raw material C was prepared as follows: 120 parts of sulfur dioxide was added to methanol containing 8 parts of methyl formate and 160 parts of methanol.
[0065] The reaction conditions, the method of addition and the overall reaction time are exactly the same as those described in Example 1. After filtering, washing and drying, 508 parts by weight of sodium hydrosulfite product were obtained, with a content of 91...
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