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A kind of regeneration method and device of alkylation waste sulfuric acid

A technology for alkylating waste sulfuric acid and regeneration equipment, which is applied in the direction of sulfur trioxide/sulfuric acid, chemical industry, climate sustainability, etc., can solve the problems of increasing energy consumption of sulfuric acid stripping, reduce pollutant discharge and leakage, The effect of high organic matter removal rate and low maintenance cost

Active Publication Date: 2020-01-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of regeneration method and device of alkylation waste sulfuric acid
  • A kind of regeneration method and device of alkylation waste sulfuric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Fixed bed reactors are used for regeneration, and two fixed bed reactors are set up for switching operation. 90wt% of waste sulfuric acid is heat exchanged to 150°C, mixed with circulating sulfuric acid liquid, and then heated to 265°C by microwave heater. The heated waste acid enters the reactor, and the heat carrier in the reactor is heated to 600°C by the hot stream. Around ℃, the heat carrier is 10mm silica spherical particles, and the heat flow is the incineration flue gas of the sulfur incinerator. The waste sulfuric acid is coke-deposited in the hot bed of the reactor, and the treated sulfuric acid is discharged according to the ratio of 1:0.4, and the heat is exchanged through the heat exchanger to filter the tiny particles in the filter, and the filtered sulfuric acid and oleum are mixed at 98.5% The concentrated sulfuric acid is sent to the alkylation unit for use.

Embodiment 2

[0039] The regenerative reactor adopts a rotary reactor, and the rotary reactor is equipped with 6 reaction flow channels, and the flow channels are staggered reaction and cleaning. After the 85wt% waste sulfuric acid is heat-exchanged to 160°C, it is mixed with the circulating sulfuric acid liquid and heated to 260°C by microwave heater 12. The heated waste acid enters the reactor, and the heat carrier in the reactor is heated to At about 580°C, the heat carrier is made of 15mm aluminum silicate spherical particles, and the heat flow is the incineration flue gas of the sulfur incinerator. The waste sulfuric acid is coke-deposited in the hot bed of the reactor, and the treated sulfuric acid is discharged according to the ratio of 1:0.3, and the heat is exchanged through the heat exchanger to filter the tiny particles in the filter, and the filtered sulfuric acid and oleum are mixed at 98.5% The concentrated sulfuric acid is sent to the alkylation unit for use.

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Abstract

In view of the shortage of the prior art, the invention provides a regeneration method and device for alkylated waste sulfuric acid. The method includes the following contents: waste sulfuric acid produced in an alkylation reaction is subjected to heat exchange by a heat exchanger, and then is mixed with partially-circulated regenerated sulfuric acid at the bottom of a regenerative reactor; a liquid material is heated by a heater, enters from the top of the regenerative reactor and makes contact with a bed layer loaded with a heat carrier; an organic matter in the liquid material is coked andcharred at the surface of the high temperature heat carrier, and is attached to the surface of the heat carrier; the regenerative sulfuric acid having the organic matter removed is discharged from thebottom of the regenerative reactor, a part of the regenerative sulfuric acid is circulated back to the regenerative reactor, and a part of the regenerative sulfuric acid is cooled and filtered, thenis mixed with fuming sulfuric acid and returns to an alkylation production device to continue to use. The method has the advantages of low operating temperature, mild reaction conditions, safety of reaction process, low energy consumption and the like.

Description

technical field [0001] The invention relates to a method and device 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/92
CPCC01B17/92Y02P20/10
Inventor 方向晨
Owner CHINA PETROLEUM & CHEM CORP
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