A New Horizontal Alkylation Reactor for Sulfuric Acid Process

Abstract

The invention belongs to the field of petrochemical equipment, and in particular relates to a novel horizontal alkylation reactor for sulfuric acid process, which includes a reactor main body, at least two reaction chambers are arranged in the reactor main body, and it is characterized in that: the reaction chambers are opposite to each other. independent, the left and right ends of the reactor main body are respectively provided with a premixing chamber and a settling chamber; The flow port is connected, and each reaction chamber is connected to the bottom of the distribution tank through the acid settling pipe; the mixing tank is connected to the settling chamber, and each reaction chamber is connected to the mixing tank through the overflow port; the lower part of the settling chamber is a hydrocarbon phase chamber and the acid phase chamber, a partition is set between the acid phase chamber and the hydrocarbon phase chamber, the acid phase chamber communicates with the mixing tank, and the hydrocarbon phase chamber connects with the hydrocarbon phase pump. Each reaction chamber of the reactor of the present invention is independent of each other, and the production capacity is large, the reaction effect is good, and the use is more flexible.

Description

technical field [0001] The invention belongs to the field of petrochemical equipment, and in particular relates to a novel horizontal alkylation reactor for sulfuric acid method. Background technique [0002] Alkylation reaction mainly refers to the organic addition reaction of isobutane and butene under the action of concentrated sulfuric acid to add alkane molecules to alkene molecules to form a mixture of alkane with various branched chains, collectively referred to as alkylate oil . Alkylate oil has high octane number and low Reid vapor pressure, very low sulfur content and olefin content, no benzene and aromatics, and is an excellent gasoline blending component. The use of new formula gasoline as the fuel for gasoline engines will greatly alleviate the air pollution caused by gasoline exhaust emissions. In this sense, alkylated gasoline is an environmentally friendly petrochemical product. [0003] Now the horizontal alkylation reactor is widely used in the market. T...

AI Technical Summary

Problems solved by technology

[0004] The Chinese patent No. ZL200520078557.3 discloses a horizontal alkylation reactor, which uses a saddle-type support to lie directly on the ground foundation, without a large vertical frame, and is easy to operate; the motor is directly connected to the helical agitator , simple structure, easy centering, low power consumption; the heat taker adopts U-shaped heat exchange tube bundle, which is easy to pull out and convenient for maintenance. However, the alkylation reactor has the following shortcomings and deficiencies in the production and operation process: Mechanical seal, the working environment of the mechanical seal is harsh (in the liquid phase of the reactor), the speed is high, the vibration is large, the friction and heat are large, and forced cooling is required, the system is more complicated; maintenance; frequent replacement (the service life is only 3-6 months) , high operating costs, easy to pollute the environment

②In the original plan, the U-shaped tube bundle is in a corrosive working environment, and the surface flexes violently, it is not easy to form a metal passivation layer, the corrosion is serious, and the service life is short. It may be a year or a few months and it will leak and replace, which is serious. Threat device safe and stable operation

③ The material inlet of the reactor is not ideal for material distribution, the efficiency has not yet reached expectations, and the acid consumption is high

④ The mixing of materials inside the reactor requires high strength, resulting in high power of the agitator and high energy consumption

⑤The operating scale of a single reactor is relatively small, and one can only produce 60,000-80,000 tons of alkylated oil. Large-scale alkylation units require multiple reactors to operate in parallel, which increases the difficulty of equipment maintenance and operation

[0006] However, the stepped reactor also has major disadvantages: ①There are 5-6 reaction chambers in the reactor, and the olefin material is fed into each mixing chamber in parallel branch, and the circulating isobutane and catalyst sulfuric acid start from the first reaction chamber at the front Flow through each reaction chamber in series in sequence, the final reaction product enters the settling section, and the reaction hydrocarbons are separated into the subsequent refining fractionation system, and the heavy phase sulfuric acid is recycled back to the reactor for reuse

During this operation, if there is a problem with the stirring of a reaction chamber or other reaction systems, it will seriously affect the work of the entire reactor, and must be shut down for inspection and treatment.

②Previous data generally reflect that the reaction effect of the ladder reactor is not ideal due to problems such as mixing intensity, resulting in a high dry point of the reaction product (it is necessary to install an alkylation oil fractionation tower to separate a small amount of heavy component products to ensure the dry point of the product Qualified), the yield is low, which is also C 4 The main reason why most of the alkylation field adopts horizontal eccentric reactors instead of horizontal ladder reactors

[0007] Therefore, the existing alkylation reactors on the market all have various defects and cannot meet the needs of actual production.

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