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Method for separating normal hydrocarbon and isohydrocarbon by using simulated moving bed

A technology for simulating fluidized beds and normal hydrocarbons, which is applied in the chemical industry, can solve the problems of increased equipment cost, limited adsorption column building height, and high production costs, and achieves reduced equipment investment costs, continuous and effective separation, and a wide range of carbon numbers. Effect

Active Publication Date: 2022-01-28
INNER MONGOLIA YITAI COAL BASED NEW MATERIALS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Molex process is limited by the number of fixed beds, and is only suitable for mixed raw materials containing C5-C18 normal paraffins, isoparaffins, naphthenes and aromatics, and the carbon number distribution range is narrow
In addition, the bed switching sequence in the adsorption area is fixed, and the equipment is restricted by the rotary valve, so it is not easy to switch the adsorption area flexibly. In case of emergency, it is necessary to stop the operation of the equipment and carry out maintenance
[0008] In the current Molex process, the length of the pipeline from the rotary valve to each bed of the adsorption tube is long, and the dead volume of the liquid is relatively large. In a mixed system with a small isoparaffin content, it is difficult to perform normal isomerization separation accurately.
In addition, in the normal isomerization mixed system with high carbon number (carbon number N≥16), the viscosity coefficient of the mixture is high, the fluidity is poor, and the number of theoretical plates required for separation is more
The Molex process is limited by the actual building height of the adsorption column, and the number of adsorption beds is limited, which cannot fully meet the theoretical plate number requirements for the separation of high-carbon isomerization, resulting in low product purity.
[0009] The Molex process uses a multi-channel rotary valve, the flow control is not precise, and there will be a little fluctuation. In order to reduce the impact of fluctuation on the separation purity, the equipment is equipped with multiple distributors, which increases the equipment cost and high production cost.
[0010] The existing technical scheme of using simulated moving bed to separate normal isomeric hydrocarbons is only applicable to mixed raw materials containing C5-C18 normal paraffins, isoparaffins, cycloalkanes and aromatics, and the carbon number distribution range is narrow; this technical scheme uses Single or multiple simulated moving beds with 6 to 30 fixed beds, the beds are fixed sequentially by superposition, if the bed fails and cannot be switched, the whole set of equipment needs to be shut down to replace the adsorbent; this technical solution uses 5A molecular sieve adsorbent, which has limitations Sexual applicability is limited

Method used

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  • Method for separating normal hydrocarbon and isohydrocarbon by using simulated moving bed
  • Method for separating normal hydrocarbon and isohydrocarbon by using simulated moving bed
  • Method for separating normal hydrocarbon and isohydrocarbon by using simulated moving bed

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Experimental program
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Effect test

Embodiment 1

[0080] In this embodiment, the C6 component in Table 2 is used as the raw material (the oxygen-containing organic compound content is less than 1ppm), and the mixture composed of n-octane and isooctane is used as the eluent, and the C8 eluent contains n-octane 70% (w / w) and isooctane 30% (w / w), the eluate is pretreated to remove poisons (oxygen-containing organic compounds, etc.) that are ineffective for adsorption.

[0081] Use a simulated moving bed to process the above C6 components to separate normal paraffins and isoparaffins, the operating temperature is 20°C, the operating pressure is 0.1Mpa, and the molecular sieve is 3A molecular sieve;

[0082] The product obtained in the above steps is passed into the refining tower, and the n-paraffin component with carbon number 6 is separated from the top of the tower, and the eluent component flows out from the bottom of the tower.

Embodiment 2

[0084] In this embodiment, the C8 component in Table 2 is used as the raw material (the oxygen-containing organic compound content is less than 1ppm), and the mixture composed of n-decane and isodecane is used as the eluent, and the C10 eluent contains n-decane 90% (w / w) and isodecane 10% (w / w), the eluate is pretreated to remove poisons (oxygen-containing organic compounds, etc.) that are ineffective for adsorption.

[0085] Use a simulated moving bed to process the above C8 components to separate normal paraffins and isoparaffins. The operating temperature is 40°C, the operating pressure is 0.7Mpa, and the molecular sieve is 10X molecular sieve;

[0086] Pass the product obtained in the above steps into the refining tower, separate the n-paraffin component with 8 carbon numbers from the top of the tower, and the eluent component flows out from the bottom of the tower.

Embodiment 3

[0088] In this embodiment, the C10 component in Table 2 is used as a raw material (the oxygen-containing organic compound content is less than 1ppm), and the mixture composed of n-hexane and isohexane is used as an eluent, and the C6 eluent contains n-hexane 60% ( w / w) and isohexane 40% (w / w), and the eluate is pretreated to remove poisons (oxygen-containing organic compounds, etc.) that are ineffective for adsorption.

[0089] Use a simulated moving bed to process the above C10 components to separate normal paraffins and isoparaffins. The operating temperature is 60°C, the operating pressure is 1.0Mpa, and the molecular sieve is 10X molecular sieve;

[0090] Pass the product obtained in the above steps into the refining tower, separate the n-paraffin component with carbon number 10 from the bottom of the tower, and the eluent component flows out from the top of the tower.

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Abstract

The invention relates to a method for separating normal hydrocarbon and isohydrocarbon by using a simulated fluid bed. The method comprises the steps of inputting a mixture of n-alkanes and isoalkanes with the carbon number of N into a tubular simulated fluid bed for adsorption; and eluting the n-alkanes and the isoalkanes by using an eluent. According to the method, continuous and effective separation can be achieved, the yield of n-alkanes is increased, and meanwhile, the equipment investment cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for separating normal hydrocarbons and isomeric hydrocarbons by using a simulated moving bed. Background technique [0002] Normal alkanes are saturated hydrocarbons without carbon branches. N-alkanes are widely used as catalysts, solvents, high-grade detergents, non-toxic green paints, cleaning agents in the high-end electronics industry, rust removers for equipment, sols for latex products, chlorinated paraffin additives, and release agents for toxic products , Adding raw materials for high-end washing daily chemical products, etc. [0003] The existing production of n-alkanes mainly uses refinery kerosene or diesel fractions as raw materials, which are separated by molecular sieve adsorption or isopropanol-urea dewaxing to obtain n-alkanes components. Molecular sieve adsorption separation mainly uses a fixed bed for adsorption and desorption se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G53/08
CPCC10G53/08
Inventor 张晓龙钱震刘宏宇关怀张先明张慧薛强武靖为高源苗恒曹宏成
Owner INNER MONGOLIA YITAI COAL BASED NEW MATERIALS RES INST CO LTD
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