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Method for deacidification of alkylation reaction product

An alkylation reaction and product technology, applied in the field of membrane separation, can solve the problems of system corrosion and instability of the settler, and achieve the effects of high mechanical strength, reduction of alkali consumption and waste water production, and good chemical stability.

Active Publication Date: 2014-02-26
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] The purpose of the present invention is to solve the problems of system corrosion and settler instability in the existing deacidification technology of alkylation reaction products, and provide an efficient, environmentally friendly and energy-saving method for deacidification of alkylation reaction products

Method used

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  • Method for deacidification of alkylation reaction product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] use figure 1 The process flow diagram shown.

[0046] A tubular ceramic membrane with α-alumina as the support layer and zirconia as the separation layer is selected, with an average pore size of 0.05 μm, modified with hexadecyltrimethoxysilane. The specific modification method is as follows: soak the ceramic membrane in ethanol dissolved in hexadecyltrimethoxysilane for 4 hours, wash it repeatedly with ethanol for 5 times, and finally dry it in an oven at 120°C for 3 hours. The surface contact angle of the rear ceramic membrane is 140°.

[0047] Using the deacidification method of the alkylation reaction product described in the present invention, the oil / sulfuric acid mixed emulsion is separated. After the 5L mixed emulsion was left to stand for 4 hours, the upper liquid was poured into the feed tank; the oil / sulfuric acid mixture in the feed tank was injected into the membrane module equipped with a surface-modified ceramic membrane using a pump, and the operating ...

Embodiment 2

[0049] use figure 1 The process flow diagram shown.

[0050] During the production process of petrochemical plants, a large amount of waste oil containing sulfuric acid will be produced. The main component of this waste oil is petroleum, but due to the large amount of sulfuric acid, it cannot be used directly. If the sulfuric acid component can be removed, the remaining petroleum component can still be utilized.

[0051] Use the deacidification method of the alkylation reaction product described in the present invention to separate sulfuric acid-containing petroleum. The support layer is β-alumina, and the separation layer is a tubular ceramic membrane of alumina. The average pore size is 0.2 μm, and octadecane is used. base trichlorosilane modification, the remaining modification steps are the same as in Example 1, the contact angle of water droplets on the surface of the modified ceramic membrane is 130°; the operating temperature is 40°C, and other operations are the same ...

Embodiment 3

[0053] use figure 1 The process flow diagram shown.

[0054] A large amount of waste oil will be produced in the production of propylene oxide. The current waste oil separation device often causes acidic water phase to enter the waste oil tank, which affects the quality of waste oil products and increases the corrosion of pipelines and equipment.

[0055] Use the deacidification method of the alkylation reaction product of the present invention to separate the propylene oxide production waste oil containing acidic water. The support layer is α-alumina, and the separation layer is a tubular ceramic membrane of titanium oxide. The average pore size is 0.05 μm, modified with n-butyldimethylchlorosilane, soaked for 10 hours, the remaining modification steps are the same as in Example 1, the contact angle of water droplets on the surface of the modified ceramic membrane is 95°; the operating pressure is 0.03MPa, the feed liquid The flow rate is 0.3L / min, that is, the membrane surf...

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Abstract

The invention relates to a method for deacidification of an alkylation reaction product. In the method, after being subject to gravity settling, mixed emulsified liquid of the alkylation reaction product (hydrocarbon oil) and sulfuric acid passes through a component with hydrophobic modified ceramic membrane at a membrane surface speed of 0.01-5m / s for separation, and the deacidification of oil is achieved in a cross current filtration mode under the operation pressure of 0.01-0.3MPa and at the operation temperature of 0-40 DEG C. Under the push of pressure, the oil passes through the ceramic membrane, acid in the oil is trapped, and the acid content in the obtained oil is lower than 100ppm, thereby greatly reducing alkaline usage and waste water generation amount in an acid-base refine system of an alkylation technology and reducing the use of electrostatic precipitation; and the ceramic membrane surface is subject to hydrophobic modification, thus the contact angle of water droplet on the membrane surface is 70 degrees-16 degrees. The method is suitable for removal of polar liquid in various oils, has the advantages of simple process, low energy consumption, high separation precision, no environment pollution and high economic and practical value, and is easy to achieve industrial application.

Description

technical field [0001] The invention relates to a method for deacidifying an alkylation reaction product, which belongs to the field of membrane separation. Background technique [0002] Automobile exhaust emission has become the main source of air pollution in many big cities in my country, which has seriously troubled people's lives. Therefore, the production of clean gasoline is imminent. Alkylate oil is an ideal component of clean gasoline. At present, the sulfuric acid alkylation process is mostly used in my country. The alkylation reaction product needs to be washed with concentrated sulfuric acid to remove the sulfuric acid ester, and the reactant after pickling enters the settler. However, the settler cannot completely remove the sulfuric acid. In particular, in order to improve the efficiency of the catalytic reaction, the sulfuric acid in the reactor is stirred and processed into fine droplets, which increases the difficulty of sedimentation and separation. These ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G31/11
Inventor 范益群李梅邢卫红徐南平
Owner NANJING TECH UNIV
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