Method for recovering ethylene glycol in waste liquid

A recovery method, ethylene glycol technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as poor applicability, high processing costs, and large property gaps, and reduce heating time and heating area Large, meet the effect of rapid heating

Pending Publication Date: 2022-07-29
SINOCAT ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional treatment methods for organic waste liquid are generally direct incineration or microbial treatment. The former has high energy consumption and pollution, while the latter has a small scope of application and high treatment costs.
There is also a method to carry out vacuum distillation and separation of ethylene glycol, but the separated impurities are quite different from the above-mentioned waste liquid impurities, and the applicability of the device and method is poor; secondly, it is difficult to ensure that the recovered liquid purity and longer
The recovery of precious metals can only be realized by incinerating organic waste liquid, which causes great pollution and high energy consumption

Method used

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  • Method for recovering ethylene glycol in waste liquid
  • Method for recovering ethylene glycol in waste liquid
  • Method for recovering ethylene glycol in waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) open the peristaltic pump-4 and pump the stock solution into the stock solution preheating device 5 at a rate of 500mL / min, and the temperature of the circulating heating device-3 is set to 195 ° C; flow into the stock solution evaporation tank 9, then close the valve two 10, open Stirrer 8, vacuum pump 2 27, refrigeration pump 2 28 and circulating heating device 2 12; the vacuum degree is set to 30000Pa, and the temperature of the refrigeration pump is 10°C; The holding temperature was set to 90°C.

[0049] (2) When the temperature of the waste liquid is raised to 90°C, open valve-7, at this time, substances with boiling points lower than ethylene glycol, such as water, glycolaldehyde, glyoxal, and glycolic acid, begin to evaporate in large quantities and are condensed by condensing device-2 Collected into the recycling material storage tank 1; when the solution conductivity detector 6 monitors that the solution conductivity does not change for more than 10 minutes...

Embodiment 2

[0052] (1) open the peristaltic pump-4 and pump the stock solution into the stock solution preheating device 5 at a rate of 500mL / min, and the temperature of the circulating heating device-3 is set to 195 ° C; flow into the stock solution evaporation tank 9 subsequently, close the valve two 10, open stirring 8. The second vacuum pump 27, the second refrigeration pump 28 and the second circulation heating device 12; the vacuum degree is set to 30000Pa, and the temperature of the refrigeration pump is 10 °C; Set to 90°C.

[0053] (2) When the temperature of the stock solution is raised to 90°C, open valve-7, at this time, substances with boiling points lower than ethylene glycol, such as water, glycolaldehyde, glyoxal, and glycolic acid, begin to evaporate in large quantities and are condensed and collected by condenser-2 To the reclaimed material storage tank 1; when the solution conductivity detector 6 monitors that the solution conductivity does not change for more than 10 mi...

Embodiment 3

[0055] (1) open the peristaltic pump-4 and pump the stock solution into the stock solution preheating device 5 at a rate of 500mL / min, and the temperature of the circulating heating device-3 is set to 195 ° C; flow into the stock solution evaporation tank 9 subsequently, close the valve two 10, open stirring 8. The second vacuum pump 27, the second refrigeration pump 28 and the second circulating heating device 12; set the vacuum degree to normal pressure, and the temperature of the refrigeration pump to be 10 °C; The temperature was set at 195°C.

[0056] (2) When the temperature of the waste liquid is raised to 195°C, open valve-7. At this time, substances with boiling points lower than ethylene glycol, such as water, glycolaldehyde, glyoxal, and glycolic acid, begin to evaporate in large quantities and condense through condenser-2. Collect to the reclaimed material storage tank 1; when the solution conductivity detector 6 monitors that the solution conductivity does not cha...

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Abstract

The invention discloses a method for recovering ethylene glycol in waste liquid. The method comprises the following steps: first evaporation recovery: preheating, primary evaporation and ethylene glycol evaporation; and secondary evaporation and recovery: caching, and scraping a film for evaporation. According to the method, the waste liquid is treated in two stages, in the first stage, liquid with the boiling point lower than 195 DEG C is rapidly removed, including water, glycolaldehyde, glyoxal and glycolaldehyde, and in the second stage, ethylene glycol is further separated and purified; after the ethylene glycol is completely recovered, remaining solids are salts containing noble metal particles; the separation method is high in efficiency, the purity of the recycled ethylene glycol is high, and meanwhile green recycling of precious metal can be achieved; according to the method, low-pressure evaporation is adopted, high-temperature oxidation of ethylene glycol is prevented, the stock solution can be rapidly heated to the target temperature through the preheating device, ethylene glycol distilled for the first time forms a uniform thin film on the inner wall of a wiped film through two-time evaporation and wiped film evaporation, the evaporation area is increased, the evaporation time is short, and separation is more efficient.

Description

technical field [0001] The invention belongs to the technical field of organic solvent recovery, and in particular relates to a method for recovering ethylene glycol in ethylene glycol-containing waste liquid. Background technique [0002] Platinum-carbon electrocatalysts are one of the important components in the preparation of hydrogen fuel cells. At present, the preparation of platinum-carbon electrocatalysts by reducing platinum precursors with ethylene glycol is widely used as one of the classic synthesis methods of fuel cell catalysts. Waste liquid of ethylene glycol oxidation products (glyoxal, oxalic acid, glycolic acid, glycolaldehyde), wherein most of the ethylene glycol does not change during the reaction process, and this part of ethylene glycol is recycled and reused Conducive to reducing overall costs. At the same time, precious metal particles in the waste liquid can also be recovered. [0003] At present, there is no report on a system and its process for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/02C02F1/04C02F1/08C22B7/00C22B11/00C07C29/80C07C31/20C02F101/30C02F101/34
CPCC02F1/02C02F1/04C02F1/043C02F1/08C22B7/006C22B11/042C07C29/80C02F2301/08C02F2301/063C02F2209/02C02F2101/30C02F2101/34C07C31/20
Inventor 王正罗曹钦铃付欣怡唐琪雯周卫江陈启章
Owner SINOCAT ENVIRONMENTAL TECH
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