Rectifying and refining process of synthetic coarse methanol

A technology of crude methanol and rectification, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, and preparation of organic compounds. The effect of feed concentration, reduced dosage, and reduced reflux ratio

Inactive Publication Date: 2007-03-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Through analysis and research, we found that the common three-tower process also has the following disadvantages: 1) Since the concentration of methanol discharged from the bottom of the pressurized tower is lower than that of the feed methanol, the separation degree of the atmospheric column is lower than that of the atmospheric column in the two-tower process. The degree of separation is high, and the reflux ratio required to achieve the same product purity is larger, thereby causing an increase in the unit consumption of steam in the atmospheric tower; The generated salt and excess alkali are brought into the atmospheric tower, resulting in the discharge of the atmospheric tower containing saline and alkali components, which can only be sent to sewage treatment

Method used

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  • Rectifying and refining process of synthetic coarse methanol
  • Rectifying and refining process of synthetic coarse methanol

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Crude methanol feed flow rate is 14000 / kg·h -1 , the composition is shown in Table 1, and the tower equipment parameters are shown in Table 2. Tables 3 to 6 provide the comparative data of two kinds of three-tower processes, wherein Table 3 is the comparison of material flow, Table 4 is the comparison of the feed composition of the atmospheric tower, and Table 5 is the comparison of soft water, steam consumption and methanol loss. Table 6 is a comparison of product quality and wastewater composition. (linked alcohol process)

[0016] Methanol

[0017] Pre-tower

[0018] parameters

[0019] Element

[0020] Soft water consumption (unit kg / h)

[0021] Element

Embodiment 2

[0023] Crude methanol feed flow rate is 14000 / kg·h -1 , the composition is shown in Table 1, and the tower equipment parameters are shown in Table 2. Tables 3 to 6 provide the comparative data of two kinds of three-tower processes, wherein Table 3 is the comparison of material flow, Table 4 is the comparison of the feed composition of the atmospheric tower, and Table 5 is the comparison of soft water, steam consumption and methanol loss. Table 6 is a comparison of product quality and wastewater composition. (coal-to-gas monoalcohol process)

[0024] Methanol

[0025] Pre-tower

[0026] parameters

[0027] Element

[0028] Soft water consumption (unit kg / h)

[0029] Element

[0030] Embodiment 2 illustrates: Embodiment 2 has a different place with embodiment 1 and is that the side line of the atmospheric tower tower draws out a stream of refined methanol S21 with higher ethanol concentration, which is not in embod...

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Abstract

The rectifying and refining process of synthetic coarse methanol includes the following steps: initial rectification of coarse methanol in a pre-rectifying tower with sodium hydroxide and extracting water fed from the tower top, and discharging the initially rectified methanol through the tower bottom while exhausting light impurity through the tower top; rectification in the pressurized tower and recovering rectified methanol from the tower top while exhausting waste water and discharging residual coarse methanol; rectification in the normal pressure tower and recovering rectified methanol while exhausting hetero alcohol oil from the side of the tower and returning industrial soft water from the tower bottom to the pre-rectifying tower. The present invention has low steam consumption and circular utilization of industrial soft water.

Description

technical field [0001] The invention relates to a method for rectifying and refining synthetic crude methanol, which belongs to resource and energy-saving chemical production technology. Background technique [0002] Methanol is an important organic chemical raw material and new energy fuel, and has a wide range of uses in the fields of chemical industry, light industry and clean energy. In the industrial production process of synthetic methanol, the refining of crude methanol is not only an important process that determines the quality of methanol products, but also the energy consumption of the refining process is one of the key factors affecting the production cost of methanol. Therefore, under the condition of ensuring the quality of methanol products, it is of great significance to save energy and reduce consumption in the methanol refining process. At present, the energy-saving refining process that has been widely used in the synthetic methanol industry is the three-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/04C07C29/80
Inventor 吴嘉周志超陈露林子昕胡晓萍
Owner ZHEJIANG UNIV
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