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A simulated moving bed device and a method for separating multi-component dihydric alcohols

A simulated moving bed, multi-component technology, applied in separation methods, chemical instruments and methods, solid adsorbent liquid separation, etc., can solve problems such as single structure, non-continuous operation, and low separation efficiency, and achieve the goal of improving separation efficiency Effect

Active Publication Date: 2021-01-08
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the proposed moving bed device is a series structure with a single structure. It needs to repeatedly shut down the device to add separation raw materials, and cannot operate continuously. The separation efficiency is low and needs to be further improved.

Method used

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  • A simulated moving bed device and a method for separating multi-component dihydric alcohols

Examples

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Embodiment 1

[0050] This embodiment provides a simulated moving bed device, its structure is as follows figure 1 As shown, there are 8 chromatographic columns (respectively I column, II column, III column, IV column, V column, VI column, VII column, VIII column) with built-in adsorbent NaY molecular sieve, and each chromatographic column is connected to There is a back pressure valve for adjusting the operating pressure in the chromatography column, and each chromatography column has 2 feed channels (respectively A channel, B channel) and 3 output channels (respectively D channel, E channel, F channel channel), and the chromatographic columns are connected in series with each other through connecting channels;

[0051] Valves for controlling the opening and closing of the channels are arranged on the feed channel and the output channel of each chromatographic column, and on the connection channels between adjacent chromatographic columns.

[0052] This embodiment also provides a method fo...

Embodiment 2

[0062] This embodiment provides a simulated moving bed device, the difference from Embodiment 1 is that the built-in adsorbent is Mitsubishi Chemical Holdings Co., Ltd. SP70 resin.

[0063] This embodiment also provides a method for separating multi-component dihydric alcohols. The difference from Embodiment 1 is that the simulated moving bed device provided by this embodiment is used for separation, the operating pressure is normal pressure, and the operating temperature is normal temperature. Agent is deionized water; t=305min, n=8;

[0064] Starting from the introduction of the desorbent, the extract from 0-60 minutes is a mixture of 1,2-butanediol and desorbent (1,2-butanediol mass fraction 68.98%), and after the desorbent is evaporated, the obtained The purity of 1,2-butanediol is 98.79%; the extraction liquid at 60-150 minutes is a mixture of ethylene glycol, 1,2-butanediol and analytic agent; the extraction liquid at 150-300 minutes is a mixture of ethylene glycol and ...

Embodiment 3

[0066] This embodiment provides a simulated moving bed device, which is different from Embodiment 2 in that the built-in adsorbent is DA201-A resin from Jiangsu Suqing Water Treatment Engineering Group Co., Ltd.

[0067] This embodiment also provides a method for separating multi-component diols. The difference from Example 2 is that the simulated moving bed device provided in this embodiment is used for separation. The multi-component diols are separated from 1,2-propanediol 50wt% and 50wt% of 2,3-butanediol, and ethanol as the analytical agent; t=265min, n=8;

[0068]Starting from the introduction of the desorbent, the extract from 0-70 minutes is a mixture of 2,3-butanediol and desorbent (2,3-butanediol mass fraction 60.89%), and after the desorbent is evaporated, the obtained The purity of 2,3-butanediol is 98.45%; the extract from the 70-175min is a mixture of 1,2-propanediol, 2,3-butanediol and the resolving agent; the extract from the 175-260min is 1, The mixed solutio...

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Abstract

The invention provides a simulated moving bed device and a method for separating a multi-component dihydric alcohol.The simulated moving bed device comprises at least four chromatographic columns filled with adsorbents, each chromatographic column is provided with at least two feeding channels and at least three discharging channels, and the chromatographic columns are connected in series throughconnecting channels; and valves for controlling opening and closing of the channels are arranged on the feeding channels and the discharging channels of the chromatographic columns and on connecting channels between adjacent chromatographic columns. The method comprises the following steps: introducing the multi-component dihydric alcohol into the chromatographic columns of the simulated moving bed device, then introducing a resolving agent for elution, and enabling extracted solutions of different components to flow out from different discharging channels of the chromatographic columns respectively, thereby separating the multi-component dihydric alcohol. According to the simulated moving bed device provided by the invention, different modes can be autonomously selected for separation operation through switching of a pump and the valves, so that different separation requirements are met.

Description

technical field [0001] The invention belongs to the technical field of separation of mixed alcohols, and in particular relates to a simulated moving bed device and a method for separating multi-component dihydric alcohols. Background technique [0002] In the process of coal-to-ethylene glycol, mixed alcohol is the main by-product, and a large amount of low-value utilization results in a large loss of ethylene glycol. Among them, polyols such as ethylene glycol, 1,2-propanediol, 1,2-butanediol, and 2,3-butanediol are widely used in the fields of energy, chemical industry, and materials, and are one of the key chemical products imported by my country. Ethylene glycol is an important bulk petrochemical raw material, which can be used to produce polyester fiber, antifreeze, unsaturated polyester resin, lubricant and other products, and its main by-product - multi-component mixed alcohol is also of great potential for application Chemical Products. [0003] At present, there a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D15/18C07C29/76C07C31/20
CPCB01D15/185C07C29/76C07C31/207C07C31/202
Inventor 王利国熊佩曹妍贺鹏李会泉陈家强徐爽
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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