Method for treating chlorotoluene rectification tail gas
A treatment method, the technology of chlorotoluene, applied in the direction of gas treatment, separation method, chemical instrument and method, etc., can solve the problem of low added value of acid, achieve high recovery efficiency, avoid resource waste, and achieve good separation effect
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[0029] Example 1
[0030] The mixed waste gas containing hydrogen chloride, toluene and chlorotoluene is processed according to the above method. The main devices used in this embodiment include a chlorotoluene distillation tower, a toluene distillation tower, and a hydrogen chloride distillation tower, all of which are packed towers made of stainless steel with ceramic fillers. The spray seal is 4m respectively 3 / (M 2 , H), 5m 3 / (M 2 , H), 5m 3 / (M 2 , H), 4m 3 / (M 2 , H).
[0031] The composition of the mixed waste gas containing hydrogen chloride, toluene and chlorotoluene is 1wt% toluene, 1.5wt% chlorotoluene, and the rest is 97.5wt% hydrogen chloride.
[0032] The solvent A used was methanol, the solvent B used was clay, and the solvent C used was n-butanol.
[0033] After absorption, the saturated solvent A is desorbed in the rectification tower, and the desorption temperature is 170°C to obtain chlorotoluene with a product purity of 98%. The absorbed solvent B is desorbed in ...
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[0034] Example 2
[0035] The mixed waste gas containing hydrogen chloride, toluene and chlorotoluene is processed according to the above method. The main devices used in this embodiment include a chlorotoluene distillation tower, a toluene distillation tower, and a hydrogen chloride distillation tower, all of which are packed towers made of stainless steel with ceramic fillers. The spray seal is 7m respectively 3 / (M 2 , H), 8m 3 / (M 2 , H), 6m 3 / (M 2 , H), 8m 3 / (M 2 , H).
[0036] The composition of the mixed waste gas containing hydrogen chloride, toluene and chlorotoluene is 1.5wt% toluene, 1.0wt% chlorotoluene, and the rest is 97.5wt% hydrogen chloride.
[0037] The solvent A used was butyl sulfone, the solvent B used was clay, and the solvent C used was glycerin.
[0038] The saturated solvent A is desorbed in the rectification tower at a temperature of 120°C to obtain 96% chlorotoluene. The saturated solvent B is desorbed in the rectification tower at a desorption temperature...
Example Embodiment
[0039] Example 3
[0040] The mixed waste gas containing hydrogen chloride, toluene and chlorotoluene is processed according to the above method. The main devices used in this embodiment include a chlorotoluene distillation tower, a toluene distillation tower, and a hydrogen chloride distillation tower, all of which are packed towers made of stainless steel with ceramic fillers. The spray seal is 5m respectively 3 / (M 2 , H), 7m 3 / (M 2 , H), 4m 3 / (M 2 , H), 6m 3 / (M 2 , H).
[0041] The composition of the mixed waste gas containing hydrogen chloride, toluene and chlorotoluene is 4.0wt% toluene, 3.0wt% chlorotoluene, and the rest is 93wt% hydrogen chloride.
[0042] The solvent A used was butyl sulfone, the solvent B used was clay, and the solvent C used was diethyl carbonate.
[0043] The saturated solvent A is desorbed in the rectification tower at a temperature of 190℃ to obtain chlorotoluene with a purity of 97%. The saturated solvent B is desorbed in the rectification tower at a...
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