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A method for continuous separation of high-purity normal alkanes

A technology for n-alkanes and alkanes, which is applied in the field of continuous separation of high-purity n-alkanes, can solve the problems of high technical difficulty, high operational difficulty, and high energy consumption, and achieve simple process and technical routes, increase product yield, and small equipment investment Effect

Active Publication Date: 2022-04-01
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN106699501A discloses a method for producing monomeric n-alkanes. This method uses Fischer-Tropsch synthetic oil as raw material to continuously cut out LPG and C5-C10 through multi-tower rectification in series. This technical route is difficult for continuous separation operation , The operation is not flexible enough, and the separated products are mainly C5-C10 monomer normal alkanes, and the product use is limited
For the separation of monomeric n-alkanes greater than C10, the energy consumption is high, the technical difficulty is greater, and the purity of the product obtained by the existing separation technology is low (often separated as mixed solvent oil, rather than monomeric alkanes)
Chinese patent CN108865245A discloses a method from Fischer-Tropsch synthesis products to monomeric n-alkanes. The method rectifies the Fischer-Tropsch synthesis products to obtain a variety of n-alkanes. However, the route has complicated operation process and low product purity. And other issues

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  • A method for continuous separation of high-purity normal alkanes
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  • A method for continuous separation of high-purity normal alkanes

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Embodiment 1

[0032] The cobalt-based Fischer-Tropsch synthesis product is used as the raw material, and the saturated alkane content is 97-99%. The composition is shown in Table 1.

[0033] A method for continuously separating high-purity normal alkanes, comprising the following steps:

[0034] (1) Using cobalt-based Fischer-Tropsch synthesis products as raw materials, preheating the raw materials and entering the T101 rectification tower, extracting materials with a carbon number less than C12 from the top of the tower, and extracting materials with a carbon number greater than or equal to C12 at the bottom of the tower;

[0035] (2) The material extracted from the bottom of the T101 rectification tower enters the T102 rectification tower, and C12 normal alkanes are extracted from the top of the tower, and materials with a carbon number greater than or equal to C13 are extracted from the bottom of the tower;

[0036] (3) The material extracted from the bottom of the T102 rectification tow...

Embodiment 2

[0048] The iron-based Fischer-Tropsch synthesis product after hydrogenation is used as a raw material, all of which are saturated alkanes, and the content of isoparaffins is 5-30%. The composition is shown in Table 3.

[0049] A method for continuous separation of high-purity normal paraffins in this embodiment is the same as the steps in Example 1, the only difference being:

[0050] In step (1), the iron-based Fischer-Tropsch synthesis product raw material after hydrogenation;

[0051] When steps (1)-(7) separate C12-C17 normal paraffins, the number of theoretical plates of the T101 rectification tower is 40, the feed position is 15 blocks downward from the top of the tower, the reflux ratio is 4, and the pressure is The absolute pressure is 50kPa, the temperature at the top of the tower is 133°C, and the temperature at the bottom of the tower is 175°C. The number of theoretical plates of the T102 rectification tower is 50, the feeding position is 20 plates downward from th...

Embodiment 3

[0056] A method for continuous separation of high-purity normal paraffins in this embodiment is the same as the steps in Example 1, the only difference being:

[0057] In step (1), the cobalt-based Fischer-Tropsch synthesis product is used as a raw material, wherein the saturated alkane content is 97-99%, and its composition is shown in Table 1.

[0058] When steps (1)-(7) separate C12-C17 normal paraffins, the number of theoretical plates of the T101 rectifying tower is 34, the feed position is 12 blocks downward from the top of the tower, the reflux ratio is 3, and the pressure is The absolute pressure is 70kPa, the temperature at the top of the tower is 132°C, and the temperature at the bottom of the tower is 161°C; the number of theoretical plates of the T102 rectification tower is 46, the feed position is 17 plates downward from the top of the tower, the reflux ratio is 4, and the pressure is absolute pressure 55kPa, the temperature at the top of the tower is 145°C, and t...

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Abstract

The invention discloses a method for continuously separating high-purity normal alkanes. The method uses the Fischer-Tropsch synthesis product as a raw material, and adopts a combined method of rectification and crystallization to produce C12 to C22 normal paraffin products with a purity exceeding 99.5%. Specifically: the raw material enters the T101 rectification tower, the material extracted from the bottom of the T101 rectification tower enters the T102 rectification tower, the C12 normal alkanes are extracted from the top of the tower, and the material extracted from the bottom of the T102 rectification tower enters the T103 rectification tower. By analogy, the C13-C17 n-paraffins are respectively extracted from the top of the T103 to the T107 tower, and after the above separation steps are completed, the material extracted from the bottom of the T107 rectification tower enters the T103 rectification tower, and in the T103 to T107 rectification tower C18-C22 normal alkanes are obtained respectively at the top of the tower. The invention can continuously obtain various normal alkanes, and has the characteristics of flexible operation, small equipment investment, simple process and low energy consumption in the production process.

Description

technical field [0001] The invention relates to a technology for preparing normal paraffins, in particular to a method for continuously separating high-purity normal paraffins. Background technique [0002] Normal alkanes refer to unbranched saturated alkanes, which are important raw materials for the production of many high value-added products, for example, they can be used to produce linear alkylbenzenes, chlorinated paraffins, lauric acid, brazilian acid, long-chain dibasic acids, etc. , can also be used in daily chemical products, lubricating oil, nylon manufacturing, oil adhesives, ink coatings and other fields. n-alkanes are also raw materials for the production of plasticizers and petroleum proteins, and have a wide range of uses. [0003] At present, the preparation method of normal alkanes is mainly as follows: (1) adopt the method for iodoalkane reduction; (2) adopt the method for preparing even-numbered normal alkanes by Wurtz reaction; (3) use sherwood oil, norm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/02C10G7/12B01D3/14B01D3/42
CPCC10G53/02C10G7/12B01D3/143B01D3/4227C10G2300/1022C10G2300/1081
Inventor 李德宝马中义贾丽涛侯博
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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