Separation and purification device for C8-C20 n-alkane mixed fractions and separation and purification process thereof

A C8-C20, n-paraffin technology, applied in distillation separation, distillation purification/separation, hydrocarbon distillation, etc., can solve the problems of low thermal efficiency, high equipment investment cost, and high energy consumption, and achieve process simplification and reduced energy consumption. Effect

CN111073677AInactive Publication Date: 2020-04-28CHINA PETROLEUM & CHEM CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-04-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a separation and purification device for C8-C20 n-alkane mixed fractions and a separation and purification process thereof, the separation and purification device combines a partition plate rectifying tower and a conventional rectifying tower, the traditional multi-tower series process is simplified, a side extraction stream is added, and the separation of a target productis realized. The separation and purification are carried out on the target product C8-C20 n-alkane mixed fraction; according to the method, the seven products, namely the lightest C8-C11 mixture, theheaviest C17-C20 mixture and the high-purity C12, C13, C14, C15 and C16 single-component products, are obtained, so that the traditional process flow is greatly simplified, the energy consumption of the whole process is remarkably reduced, and the method has remarkable practicability and economical efficiency.
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Description

technical field

[0001] The invention relates to the field of petrochemical technology, in particular to a separation and purification device and a separation and purification process for C8-C20 normal paraffin mixed fractions. Background technique

[0002] Fischer-Tropsch synthesis, also known as F-T synthesis, is a process of synthesizing liquid hydrocarbons or hydrocarbons under catalysts and appropriate conditions using synthesis gas (mixed gas of carbon monoxide and hydrogen) generated from coal or natural gas as raw material.

[0003] The mixed fraction contained in Fischer-Tropsch synthetic oil mostly includes C8-C20 normal paraffins. In industry, high-purity C12-C16 n-alkanes can be prepared using this as a raw material. n-dodecane is mainly used as the main additive raw material for aerosol insecticides, pesticides, and high-end washing daily chemical products; n-alkanes (C13 -C14) Solvent raw oil used in paint, rubber, latex and other industries, is the main additi...

Examples

Embodiment 1

[0047] The traditional process is simplified and transformed by the partition rectification technology, and the C8-C20 mixed fraction in the Fischer-Tropsch synthetic oil is separated by using the process flow integrating the partition rectification tower and the conventional rectification tower. The whole process includes two conventional rectification towers with two partitioned columns, such as figure 1 shown.

[0048] The C8-C20 mixed distillate raw material is fed from the 27th tray of the left pre-fractionation column section of the partitioned rectification column T1 at a mass flow rate of 500kg / h under the state of 135kPa and bubble point temperature. The number of theoretical plates in the partition section of partition rectification column T1 is 60, and the number of theoretical plates in the common rectification column section is 30. The side stream is drawn from the 23rd tray on the right side of the partition, and the common stripping The number of trays was 30. ...