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Method for preparing high-purity anhydrous formic acid from inorganic acid acidification formate

A technology of inorganic acid and formate, which is applied in the chemical industry, can solve the problems of waste of resources, etc., and achieve the effects of economical, applicable and environmental protection, low production cost, and no discharge of three wastes

Active Publication Date: 2015-07-22
重庆万盛川东化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, it is a waste of resources to consume additional valuable carbon resources to produce methyl formate for hydrolysis to obtain higher quality formic acid

Method used

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  • Method for preparing high-purity anhydrous formic acid from inorganic acid acidification formate
  • Method for preparing high-purity anhydrous formic acid from inorganic acid acidification formate

Examples

Experimental program
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Effect test

Embodiment 1

[0037]One device 1, φ1300×3500, and supporting devices 11, 12, 13, 14, 15, 16; one device 2, φ300×12000, and equipped with device 21; one device 3, φ300×12000; device 4 One set, φ300×15000, equipped with device 41, the number of stages is 18; one set of device 5, cooling area 20M2; one set of device 6, 500×500×5000, 20 stages, 5Kg / h of pure water. It is connected as figure 1 shown.

[0038] The absorption liquid in the device-2 is 80% formic acid, 3% trisodium phosphate, and 17% water.

[0039] With every batch of sodium formate (97%) 200Kg, 98% sulfuric acid 140Kg, every 20 minutes a batch of speed is dropped in device 1 by device 11 and 12 through 13, and the formic acid steam that reaction generates enters device 2, device successively after device 15 3, device 4, device 5, device 6, discharge the formic acid of content 79.5% in device 41, flow rate 47Kg / h. Discharge the high-purity anhydrous formic acid of content 99.85% at the bottom of device 5, flow 291Kg / h. Dischar...

Embodiment 2

[0041] One set of device 1, φ1300×3500, and supporting devices 11, 12, 13, 14, 15, 16; one set of device 2, φ300×12000, and equipped with devices 21, 22, 23, the absorption liquid is 78% formic acid , 5% sodium tripolyphosphate, 17% water; one device 3, φ300×12000; one device 4, φ300×15000, and equipped with device 41, the number of stages is 18; one device 5, cooling The area is 20M2; 6 devices, 500×500×5000, 20 grades, 5Kg / h of pure water. It is connected as figure 2 shown.

[0042] With every batch of sodium formate (97%) 200Kg, 98% phosphoric acid 285Kg, every 20 minutes a batch of speed is dropped in device 1 by device 11 and 12 through 13, and the formic acid steam that reaction generates enters device 2, device successively after device 15 3. Device 4, Device 5, Device 6. Discharge the formic acid of content 79.5% in device 41, flow rate 59Kg / h. Discharge the high-purity anhydrous formic acid of content 99.97% at the bottom of device 5, flow 295Kg / h. Discharge con...

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Abstract

The invention provides a method for producing formic acid from sodium formate. The method comprises the following steps: enabling mineral acid to react with formate, and removing volatile matters. The method is characterized in that the step of removing the volatile matters comprises a step of introducing a reaction liquid into an absorbing liquid, wherein the absorbing liquid contains a 60-80% formic acid solution (preferably 75-80%); 1-10% of a processing additive is also added; the processing additive is one or more of phosphate, polyphosphate and sulfate of potassium, sodium and calcium. Industrial formic acid of which the production content of inorganic acid acidification formate is 85-95% is further developed, the purity of the obtained high-purity anhydrous formic acid can be greater than 99.99%, the moisture of the obtained high-purity anhydrous formic acid is less than 0.3%, and the high-purity anhydrous formic acid can be directly applied to organic synthesis and synthesis of multiple medicines.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to the preparation of high-purity anhydrous formic acid. Background technique [0002] Formic acid is prepared by adding sulfuric acid, phosphoric acid, superphosphoric acid or polymeric phosphoric acid into formic acid salts such as sodium formate or potassium formate, etc., for acidification, which is disclosed in patents such as 97103209, 200610124470, 200610200857, 200710049836, 200710049837, 200710200045, etc. methods, which have proven effective over the years. However, since all these processes do not carry out fine and effective purification and dehydration of the formic acid vapor generated, the content of the formic acid produced is in the range of 85% to 95%, and the impurity content is also very high, so it can only be used as a general industrial use. In organic synthesis, especially in pharmaceutical production, the purity of formic acid used as a raw material is ver...

Claims

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Application Information

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IPC IPC(8): C07C51/02C07C51/42C07C53/02
CPCC07C51/02C07C51/42C07C53/02
Inventor 沈连芳
Owner 重庆万盛川东化工有限公司
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