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Separation process of mixed pentane

A technology of mixing pentane and process, applied in the direction of distillation purification/separation, organic chemistry, etc., can solve the problems of high energy consumption, low product yield, difficult control of impurity content, etc., and achieve the effect of reducing energy consumption

Inactive Publication Date: 2013-05-01
南京炼油厂有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current method of separating and mixing pentane in China usually adopts the conventional sequential rectification process, and the internal parts of the tower adopt floating valve tray or corrugated plate structured packing. Difficult to control, low yield of main products
[0005] Chinese patent CN200910069668.0 proposes a process and method for separating mixed pentane isomers by double-effect distillation, but its raw materials, product requirements and separation process are significantly different from those of the present invention, and the energy consumption is high

Method used

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  • Separation process of mixed pentane
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Examples

Experimental program
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Effect test

Embodiment 1

[0028] Using process 1 ( figure 1 ) Pentane separation process: use mixed pentane raw materials to produce pentane blowing agent, the main product is isopentane: n-pentane = (30±3): (70±3) blowing agent mixed with pentane, using differential Pressure-coupled rectification process, the external heat source of the device is heat transfer oil at 210-220 °C provided by the system, the raw material passes through the heat exchanger at the bottom of the de-heavy tower [10], the heat exchanger at the bottom of the de-light tower [6] and the hot material After exchanging heat to 90-100°C, it enters the light removal tower [1], and the oil gas at the top of the light removal tower goes through the reboiler [3] at the bottom of the light removal tower after being fully condensed and then enters the light removal tower reflux tank [5], and part of it is used as the top reflux of the tower Returning to the top of the tower, part of it will be sent out to the device after being cooled as l...

Embodiment 2

[0030] Using process 2 ( figure 2 ) Pentane separation process: use mixed pentane raw materials to produce high-purity isopentane, the main product is isopentane ≥ 96℅, adopt conventional sequential differential pressure coupling rectification process, the external heat source of the device is provided by the system 170 ~ 185 ℃ steam, the raw material enters the heavy removal tower [2] after heat exchange with the hot material at the bottom heat exchanger [10] of the heavy removal tower to 50-60 ° C, and the oil gas at the top of the heavy removal tower passes through the top condenser of the heavy removal tower [7 ] enters the top reflux tank of the de-heavy tower after condensation [8], part of it returns to the top of the tower as the reflux of the top of the tower, and part of it is sent out to the device after being cooled as a light component product, and the bottom oil of the de-heavy tower exchanges heat with the top and bottom of the de-light [11] and [6] exchange he...

Embodiment 3

[0032] Using process 2 ( figure 2) Pentane separation process: use mixed pentane raw materials to produce high-purity n-pentane, the main product is n-pentane ≥ 96℅, adopt differential pressure coupled rectification process, and the external heat source of the device is provided by the system at 210-220 °C Heat conduction oil, the raw material enters the weight removal tower [2] after exchanging heat with the heat material at the bottom of the weight removal tower [10] to 70-80 ° C, and the weight removal tower is provided at the bottom of the weight removal tower to provide the heat required for rectification. Bottom reboiler [3], the heat source is the oil and gas at the top of the de-weighting tower, the operating pressure of the de-weighting tower is 0.15-0.35 MPa (a), the temperature at the top of the tower is 48-53°C, and the bottom oil of the de-weighting tower is exchanged through the bottom of the de-weighting tower The heater [10] is cooled to 38-44°C and discharged...

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Abstract

The invention relates to a separation process of mixed pentane, and the separation process adopts a differential-pressure coupling rectifying technology for separating light components from pentane through higher pressure and for separating pentane from heavy components through lower pressure. The light components are firstly separated from the pentane through higher pressure, and then the pentane is separated from the heavy components through lower pressure; or the light components and the pentane are firstly separated from the heavy components through lower pressure, and then the light components are separated from the pentane through higher pressure. The separation process has the advantages that by pressurizing a light component removal tower, the oil-gas temperature on the top of the light component removal tower is increased, so that the oil gas can be used as the heat source of a heavy component removal tower; meanwhile, by adopting low-pressure-drop and high-efficient tower internals, the light component removal tower and the heavy component removal tower can be possibly coupled; adequate heat exchanging between raw materials and heat materials in the system can enable the recovery of majority of waste heat of the system; and compared with an ordinary two-tower sequential separation flow, the energy consumption of the entire process is reduced by 30 to 50 percent.

Description

technical field [0001] The invention relates to a process for separating mixed pentane from mixed pentane raw materials. technical background [0002] Pentane products have a wide range of uses, and can be used as a blowing agent for expandable polystyrene and polyurethane foam systems, used in the fields of fluorine-free refrigerators, freezers, cold storage, and pipeline insulation; can be used as a carrier solvent for linear low-density polyethylene catalysts , industrial solvent for deasphalting, extractant for molecular sieve dewaxing, etc.; can also be used as chemical raw materials, such as isopentane dehydrogenation to produce isopentene, isoprene, pentane mixture through chlorination, rectification, catalytic hydrolysis, Crude pentanol can be produced, and l-pentanol can be obtained after multi-stage separation and distillation. At the same time, the research on the oxidation of n-pentane to produce phthalic anhydride and maleic anhydride has also made some progress...

Claims

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Application Information

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IPC IPC(8): C07C9/18C07C9/16C07C7/04
Inventor 王文丰朱怀工陆林玮丁正兴余德忠郭建光林芝东
Owner 南京炼油厂有限责任公司