A kind of regeneration method of alkylation waste sulfuric acid
A technology for alkylating waste sulfuric acid and waste sulfuric acid, which is applied in the direction of sulfur trioxide/sulfuric acid, etc., can solve the problems of increasing the energy consumption of sulfuric acid stripping, achieve the reduction of exhaust gas pollutant emissions, low energy consumption in operation, and reduce the intermediate storage process Effect
Active Publication Date: 2019-12-13
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
During the reaction process, the regenerated sulfuric acid needs to be stripped after the oxidant is introduced, which increases the energy consumption of sulfuric acid stripping
Method used
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Embodiment 1
[0033] 90wt% of waste sulfuric acid is heat exchanged to 120°C, and mixed with circulating sulfuric acid liquid into reactor 2. The ratio of the first packed bed to the second packed bed in the reactor is 1:1, and the second packed bed The heat carrier of the layer is heated to about 600°C by microwave. The heat carrier of the first packed bed and the second packed bed is made of 10mm silica spherical particles, and the regenerated heat stream 1 of the reactor 2 uses the incineration flue gas of the sulfur incinerator. The waste sulfuric acid cokes and deposits carbon in the hot bed of reactor 2, and the treated sulfuric acid is discharged according to the ratio of 1:0.4, and is exchanged through the heat exchanger to filter tiny particles in the filter, and the filtered sulfuric acid and oleum are mixed at 98.5 % concentrated sulfuric acid is sent to the alkylation unit for use.
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The invention discloses a regeneration method of waste sulfuric acid from alkylation. The regeneration method comprises the following contents: the waste sulfuric acid generated in alkylation reactionis firstly subjected to heat exchange by a heat exchanger, mixed with partially recycled regenerated sulfuric acid at the bottom of a regeneration reactor, and a mixed liquid material enters the regeneration reactor from the top, flows through a first filler layer filled with a heat carrier, is uniformly dispersed in the first filler layer and absorbs mass transfer; then the material flows through a second filler layer filled with the heat carrier, organic matter in the liquid phase material is coked and carbonized on the surface of the high-temperature heat carrier and adhered to the surfaceof the heat carrier, regenerated sulfuric acid with the organic matter removed is discharged through the bottom of the regeneration reactor, part of the regenerated sulfuric acid is recycled back tothe regeneration reactor, part of the regenerated sulfuric acid is cooled and filtered and mixed with oleum, and the mixture returns to an alkylation production unit for continuous use. Aiming at defects in the prior art, the invention provides the regeneration method of waste sulfuric acid from alkylation. The method has the advantages of low operating temperature, mild reaction conditions, safereaction process, low energy consumption and the like.
Description
technical field [0001] The invention relates to a method for regenerating waste sulfuric acid produced in an alkylation reaction. Background technique [0002] In order to improve the quality of gasoline, the light hydrocarbon oil formed after alkylation is added to gasoline. In the alkylation reaction, concentrated sulfuric acid is often used as a catalyst. Generally, about 0.1t of waste sulfuric acid is produced for every 1t of light hydrocarbon oil produced, and its composition contains 80%~95% of H 2 SO 4 In addition, it also contains 3% to 8% organic matter and 2% to 8% water. The organic matter is mainly high molecular olefins, dienes, alkyl sulfonic acids, sulfuric acid esters and mercaptans. Alkylation waste acid is black and viscous, highly corrosive, unstable in nature, and emits a special odor. It is extremely harmful to humans, animals, and the environment. It has no reuse value and must be effectively disposed of. [0003] There are mainly several methods for...
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IPC IPC(8): C01B17/92
CPCC01B17/92
Inventor 方向晨
Owner CHINA PETROLEUM & CHEM CORP
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