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Refining process and device for crude methanol

A process device and crude methanol technology, applied in separation methods, chemical instruments and methods, preparation of hydroxyl compounds, etc., to achieve the effects of convenient construction, flexible parameter control, and reduced quantity, such as old process transformation and equipment layout

Pending Publication Date: 2021-08-27
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complexity of the process, the five-tower process has high requirements for equipment transformation, layout, and pipeline direction. How to formulate a suitable process plan and reduce the difficulty of project transformation implementation is a technical problem that technicians in the field need to solve urgently.

Method used

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  • Refining process and device for crude methanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] see figure 1 , a crude methanol refining process device, comprising: a pretreatment unit, a high-pressure treatment unit, a low-pressure treatment unit, an atmospheric pressure treatment unit and a recovery treatment unit;

[0081] The pretreatment unit, high pressure treatment unit, low pressure treatment unit, normal pressure treatment unit and recovery treatment unit are connected in sequence;

[0082] Wherein, the pretreatment unit includes: the pre-rectification tower T101, the first condensing unit, the first reboiler E103, the first bottom transfer pump P102 and the heat exchanger E104; the top of the pre-rectification tower T101 and the first condensing Unit connection; the bottom of the pre-distillation tower T101 is divided into two branches, one is connected with the first reboiler E103, and the other is connected with the first bottom transfer pump P102, heat exchanger E104 and high-pressure processing unit in sequence ;

[0083] The high-pressure treatmen...

Embodiment 2

[0103] Such as figure 1 Shown in (dotted line represents heat flow through direction), a kind of crude methanol refining process method, adopts the processing device that embodiment 1 provides, specifically comprises the following steps:

[0104] (1) Crude methanol (40°C, 0.57MPa, 31244kg / h) enters the pre-distillation tower T101, passes through 51 trays or several stages of full gas-liquid contact, and a small amount of light components and gaseous methanol are extracted from the top of the tower Enter the first flash tank V101 through the first condenser E101, and the gas phase obtained by the flash continues to enter the second flash tank V102 through the second condenser E102 for gas-liquid separation, and the non-condensable gas (37.78°C, 0.13MPa) is discharged, and the liquid phase Enter the phase separator V103, the liquid phase of light components and impurities is discharged to wastewater treatment, the liquid phase of crude methanol is mixed with the liquid phase str...

Embodiment 3

[0110] like figure 1 As shown, a crude methanol refining process, using the process device provided in Example 1, specifically comprises the following steps:

[0111] (1) Crude methanol (40°C, 0.57MPa, 31244kg / h) enters the pre-distillation tower T101, passes through 54 layers of trays or several stages of full gas-liquid contact, and a small amount of light components and gaseous methanol are extracted from the top of the tower Enter the first flash tank V101 through the first condenser E101, and the gas phase obtained by the flash continues to enter the second flash tank V102 through the second condenser E102 for gas-liquid separation, and the non-condensable gas (37.79°C, 0.12MPa) is discharged, and the liquid phase Enter the phase separator V103, the liquid phase of light components and impurities is discharged to wastewater treatment, the liquid phase of crude methanol is mixed with the liquid phase stream in the first flash tank V101, and enters the first tower top reflu...

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Abstract

The invention discloses a refining process and device for crude methanol. The refining device comprises a pretreatment unit, a high-pressure treatment unit, a low-pressure treatment unit, a normal-pressure treatment unit and a recovery treatment unit, wherein the pretreatment unit, the high-pressure treatment unit, the low-pressure treatment unit, the normal-pressure treatment unit and the recovery treatment unit are connected in sequence. The invention further discloses the process for refining crude methanol by using refining device for crude methanol. In the method, the gas-phase heat of refined methanol extracted from the top of a high-pressure rectifying tower is used as a heat source of a reboiler at the bottom of a low-pressure rectifying tower, the heat of methanol gas at the top of the low-pressure rectifying tower is used as a heat source of a reboiler at the bottom of a normal-pressure rectifying tower, and the heat of tower-bottom waste liquid of the normal-pressure rectifying tower is used for preheating feeding flow of the high-pressure rectifying tower. According to the process provided by the invention, the heat of gas-phase materials at the tops of the high-pressure and low-pressure rectifying towers is reasonably distributed, the heat of a wastewater material flow at the bottom of the normal-pressure rectifying tower is fully utilized, and the energy consumption of a methanol rectifying system is reduced to the maximum extent.

Description

technical field [0001] The invention relates to the field of rectification and purification of chemical materials, in particular to a crude methanol refining process method and a device thereof. Background technique [0002] Methanol is an important chemical basic raw material, which can be used in industries such as organic products, pesticides, dyes and national defense. The raw material gas for synthesizing methanol is mainly gas and liquid fuel, and the process includes gas production, synthesis purification, methanol synthesis and crude methanol rectification. [0003] As an important process of methanol refining, methanol rectification consumes about 20% of the energy consumed by the entire methanol plant. The pursuit of energy-saving, high-efficiency, and advanced distillation processes plays an important role in reducing the cost of methanol, expanding production capacity, and improving product competitiveness. [0004] However, the further expansion of the methanol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/14B01D3/06C07C29/80C07C31/04
CPCB01D3/146B01D3/065C07C29/80C07C31/04
Inventor 夏力孙晓岩毕荣山项曙光
Owner QINGDAO UNIV OF SCI & TECH
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