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Alkylation method for isobutane and C3-C5 olefins

A technology of alkene alkyl and isobutane is applied in the field of alkylation reaction between isobutane and C3-C5 alkene, and can solve the problems of low octane number of reaction products, short alkylation reaction time, incomplete reaction and the like, To achieve the effect of being beneficial to the octane number of the product, the reaction is sufficient, and the octane number is improved

Active Publication Date: 2018-04-03
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide a method for the alkylation of isobutane and C3-C5 olefins, to overcome the problems of short alkylation reaction time, incomplete reaction and low octane number of reaction products in the prior art

Method used

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  • Alkylation method for isobutane and C3-C5 olefins

Examples

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Embodiment 1

[0050] device see figure 1shown. The raw material hydrocarbon and catalyst sulfuric acid enter the rotary packed bed 1 through the delivery pipe 4 respectively, and are mixed in the rotary packed bed filler 15 to form the acid hydrocarbon emulsion of the raw material hydrocarbon and sulfuric acid, and start to react, wherein the rotary packed bed is the Liquid-liquid dispersion device. Then, it is thrown out under the action of the centrifugal force of the rotating packing, and the reaction material formed of unreacted raw material hydrocarbon, product and sulfuric acid is formed at the outlet of the rotating packed bed. The reaction materials enter the stirred reactor 2 to continue the reaction. The stirred reactor is driven by the motor 6, and the pressure of the stirred reactor is adjusted by filling nitrogen, methane, ethane and other gases through the gas-filling tube 16. The reaction material of the stirring reactor enters the acid hydrocarbon separator 13 through the ...

Embodiment 2

[0063] The difference from Example 1 is that the pressure of the stirred reactor is 0.31 MPa by filling nitrogen gas, the stirring blade is a pitched paddle, and the ratio of the diameter of the paddle to the diameter of the stirred reactor is 1 / 3, and the others are the same as in Example 1. The resulting alkylate had an octane number of 97.2 (research octane number).

Embodiment 3

[0065] The device and operation flow are the same as in Example 1. The molar ratio of isobutane to olefin in the raw material hydrocarbon is 10:1, wherein the olefin is 1-butene, the reaction temperature of the rotating packed bed is 3° C., and the dispersed phase of the acid hydrocarbon emulsion is averaged The diameter is 4.9 μm, the reaction temperature of the stirred reactor is 10°C, the stirring impeller is a bifold paddle, the ratio of the diameter of the paddle to the diameter of the stirred reactor is 1 / 4, and the pressure of the stirred reactor is 0.3 MPa (reaction material The bubble point pressure is 0.2MPa), the average residence time of the reaction material in the stirred reactor is 60min, and the volume ratio of the liquid hydrocarbon in the reaction material to the catalyst sulfuric acid is 1:1.2. The resulting alkylate had an octane number of 97.1 (research octane number).

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Abstract

The invention discloses an alkylation method for isobutane and C3-C5 olefins. The method comprises the following steps: S1, raw hydrocarbon containing isobutane and C3-C5 olefins as well as a catalystsulfuric acid are added to a liquid-liquid separation device, acid hydrocarbon emulsion with average diameter of dispersed-phase droplets smaller than 20 mu m is formed, dispersed isobutane, C3-C5 olefins and the catalyst sulfuric acid are subjected to a contact reaction at the temperature of subzero 5 DEG C-4 DEG C, and a mixed reaction material containing unreacted raw hydrocarbon, a reaction product and sulfuric acid is formed at an outlet of the liquid-liquid separation device; S2, the reaction material in S1 enters a stirring reactor for continuous reaction at the temperature of 5-20 DEGC; S3, alkylated oil is separated from a reaction product in S2. Alkylation reaction time when acid hydrocarbon is highly dispersed can be prolonged, adverse impact of incomplete reaction on octane value of the alkylation product is reduced, and the octane value of the alkylation product is increased.

Description

technical field [0001] The invention relates to an alkylation reaction method, in particular to an alkylation reaction method of isobutane and C3-C5 olefins catalyzed by sulfuric acid. Background technique [0002] The alkylated oil produced by the alkylation of isobutane and C3-C5 olefins has high octane number (research method octane number is generally 90-96), low vapor pressure, low content of aromatics and olefins, good sensitivity, etc. The characteristic is that it is a clean and environment-friendly high-octane gasoline blending component. With the increasingly stringent restrictions on olefins, aromatics and sulfur content in gasoline by environmental protection regulations, the importance of alkylate has become increasingly prominent. [0003] At present, the liquid acid alkylation process using sulfuric acid or hydrofluoric acid as a catalyst is widely used in the oil refining industry. The liquid acid alkylation process is characterized by good selectivity, low...

Claims

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Application Information

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IPC IPC(8): C07C2/62C07C9/16C07C9/21
CPCC07C2/62C07C9/16C07C9/21C07C2527/054
Inventor 何涛波高飞董卫刚胡雪生张兆前周华群王若欣
Owner PETROCHINA CO LTD
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