Method and device for continuously concentrating glyoxylic acid

A technology of glyoxylic acid and concentrated liquid, applied in the field of concentration, can solve the problems affecting the quality and stability of glyoxylic acid products, low equipment capacity, and high energy consumption, so as to achieve good product quality and quality stability, and increase equipment capacity. , the effect of low energy consumption

Inactive Publication Date: 2015-09-23
HUBEI HONGYUAN PHARMA
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Problems solved by technology

[0012] The present invention aims at the defects of existing glyoxylic acid aqueous solution concentration process and equipment, provides a glyoxylic acid concentration method and device, and solves the problem that the concentration process and equipment in the prior art seriously affect the quality and stability of glyoxylic acid products In order to achieve the goal of saving energy, reducing consumption, improving quality and increasing efficiency

Method used

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  • Method and device for continuously concentrating glyoxylic acid
  • Method and device for continuously concentrating glyoxylic acid
  • Method and device for continuously concentrating glyoxylic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] see image 3 , Embodiment 1 provides a kind of device of continuously concentrating glyoxylic acid, and this device comprises evaporator 1, heater 2, demister 3, condenser 4, receiving tank 5, buffer tank 6, scrubbing tank 7, high Vacuum unit 8, raw liquid container 9, concentrated liquid container 10, distillate liquid container 11, production pump 12, distillate liquid delivery pump 13, raw liquid feed flow meter 14, concentrated liquid production flow meter 15, etc. Wherein, the aforementioned structures or their inner linings are all made of materials capable of resisting material corrosion.

[0041] Among them, the evaporator 1 and the heater 2 are connected through a circulation pipeline to form a circulation loop. The evaporator 1 has its own concentrated liquid circulation to form a self-circulation to improve heat transfer efficiency. The evaporator 1, demister 3, condenser 4, receiving Tank 5, buffer tank 6, scrubber tank 7 and high-vacuum unit 8 are connecte...

Embodiment 2

[0048] see figure 2 , the embodiment of the present invention provides a method for continuously concentrating glyoxylic acid, using the device of embodiment 1, the specific operation process of the method is as follows:

[0049] (1) Start-up system vacuum debugging process: After checking that all equipment is normal, start the high-vacuum unit 8, debug the system vacuum, and stabilize the no-load vacuum degree displayed by the evaporator 1 pressure gauge at 0.95kgf / cm 2 above.

[0050] (2) Pre-feeding concentration and stabilization process: Open the discharge valve of the stock solution container 9 and the feed valve A of the evaporator 1, and use the vacuum to add the stock solution of the glyoxylic acid aqueous solution for the first time to 70-85% of the normal maximum capacity of the evaporator 1 Finally, close the feed valve A and stop feeding. Open the discharge valve B of the evaporator, the feed valve C of the heater, the heating medium G of the heater 2, the coo...

Embodiment 3

[0057] Embodiment 3 provides a kind of method of continuously concentrating glyoxylic acid, comprises the following steps:

[0058] In step (1), the no-load vacuum is stabilized at 0.97-0.98kgf / cm 2 .

[0059] In step (2), the amount of the glyoxylic acid solution stock solution added for the first time is 70% of the normal maximum capacity of the evaporator 1, and as the concentration proceeds, additional stock solution is added to maintain the liquid level of the evaporator 1 at the normal maximum capacity 70% of. The concentration temperature is 50-56°C.

[0060] In step (3), the liquid level in the evaporator 1 is stabilized at 80% of the normal maximum capacity by adjusting the feed flow rate and the output flow rate. The mass concentration of glyoxylic acid in the concentrated solution is specified as 52-54%.

[0061] In step (4), evaporator 1 vacuum degree 0.92-0.93kgf / cm 2 , the concentration temperature is 50-56°C, and the liquid level in the evaporator 1 is stab...

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Abstract

The invention relates to a method and a device for continuously concentrating glyoxylic acid. A glyoxylic acid solution is concentrated by adopting a method of continuously adding a stock solution and extracting a concentrated solution. The method comprises the following steps: a switch-on vacuum debugging process, an early feeding concentration stabilizing process, a continuous feeding and extraction adjusting process, a normal continuous concentration process, a distillate intermittent transfer process and a concentration ending halt process. The device comprises an evaporator, a heater, a demister, a condenser, a receiving tank, a buffer tank, a scrubber tank, a high vacuum unit, a stock solution container, a concentrated solution container, a distillate container, an extracting pump, a distillate delivery pump, a stock solution feeding flow meter, a concentrated solution extraction flow meter and the like. The method and the device can realize continuous production of concentrated glyoxylic acid, the concentration efficiency is high, the equipment capacity can be obviously improved, the materials are short in heating time and low in temperature, the product is high in quality, high in yield and low in energy consumption, the service life of glassed steel equipment can be prolonged, and the labor intensity of workers is reduced.

Description

technical field [0001] The invention belongs to the technical field of concentration, and in particular relates to a glyoxylic acid concentration method and device, in particular to a method and device for continuously concentrating glyoxylic acid aqueous solution. Background technique [0002] Glyoxalic acid (Glyoxalic acid, CHOCOOH), also known as formaldehyde-formic acid, dihydroxy-alcoholic acid, is the simplest alkyd acid, which has the properties of both aldehyde and acid. It is an important fine chemical raw material and intermediate, widely used It is used in the synthesis of light industrial products such as spices, medicines, pesticides, papermaking, coatings, paints, leather and food additives. At present, the most commonly used synthesis methods of glyoxylic acid in industry include nitric acid oxidation of glyoxal and electrolytic reduction of oxalic acid. [0003] At present, the main specifications of glyoxylic acid products in the international and domestic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/43C07C59/147B01D1/00B01D1/30
CPCB01D1/00B01D1/0082B01D1/30B01D1/305C07C51/43C07C59/147
Inventor 鲍应元汪林涛邓支华彭秋知晏浩哲
Owner HUBEI HONGYUAN PHARMA
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