Novel purification method for formic acid

A new method and technology of formic acid, applied in the field of formic acid purification, can solve the problems of environmental pollution, high cost, large consumption of entrainer, etc., and achieve the effects of reduced process cost, easy distillation temperature and low energy consumption

Active Publication Date: 2009-03-25
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect described in this patented technology allows for efficient purification of highly concentrated forms of formaldehyde (formaldehydes). This results from adding small amounts of strong acids like hydrochloric acid at specific temperatures without requiring excessive heat input during reaction processes. By doing these techniques, less power than traditional methods may also result with improved efficiency compared to existing technologies such as evaporation/distilling or solvent extraction systems. Additionally, there's no harmful chemical residue left behind when treatments involving decomposition products have been done afterwards due to its lower volatility. Overall, this new approach provides effective ways to produce pure formyl alcohol while reducing costs associated with conventional manufacturing procedures.

Problems solved by technology

This technical problem addressed in this patents relates to improving the efficiency and economics of producing highly concentrated forms of formaldehyde through chemical reduction processes such as forming ammonia or oxazolidine compounds. Current techniques involve generating excessive amounts of wastewater containing harmful substances like phenol during manufacturing process steps. Therefore there are needs for improved ways to recover these materials without causing contamination issues.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In the 2000 milliliter three-necked round-bottomed flask that has constant temperature oil bath, thermometer, electric stirring, add 1554 grams (14.0 mole) calcium chloride anhydrous, then add the formic acid solution 800 grams of content 50% (wherein formic acid contains the substance of water The amount is 22.2 moles), and at a temperature of 80 to 95° C., heated and stirred for 5 hours to dissolve calcium chloride. After the calcium chloride is dissolved, distill under normal pressure and collect fractions at 100-106°C. 409.6 g of formic acid with a content of 91.6% was obtained, and the recovery rate of formic acid was 93.8%. The remaining calcium chloride solution is subjected to vacuum distillation and dehydration at a temperature of 150-180° C. and a vacuum degree of 0.09-0.095 MPa to evaporate the calcium chloride to dryness and apply it to the next batch.

Embodiment 2

[0023] Add 830 grams (7.5 moles) of anhydrous calcium chloride in a 1000 milliliter three-neck round bottom flask with constant temperature oil bath, thermometer and electric stirring, then add 400 grams of formic acid solution with a content of 44% (wherein the formic acid contains water The amount is 12.4 moles), at a temperature of 80-95°C, heated and stirred for 4 hours to dissolve calcium chloride, after the calcium chloride was dissolved, distilled at atmospheric pressure, collected 100-106°C cuts, and obtained 181.6 grams with a content of 91.1% formic acid, formic acid recovery rate 94.0%. The remaining calcium chloride solution is subjected to vacuum distillation and dehydration at a temperature of 150-180° C. and a vacuum degree of 0.09-0.095 MPa to evaporate the calcium chloride to dryness and apply it to the next batch.

Embodiment 3

[0025] Add 365 grams (3.3 moles) of anhydrous calcium chloride in a 500 milliliter three-necked round-bottomed flask with constant temperature oil bath, thermometer and electric stirring, then add 160 grams of formic acid solution with a content of 40% (the substance containing water in the formic acid The amount is 5.3 moles), at a temperature of 80-95°C, heat and stir for 4 hours to dissolve calcium chloride, after the calcium chloride is dissolved, distill at atmospheric pressure, collect the fraction at 100-106°C, and obtain 65.9 grams of 90.8% formic acid, formic acid recovery rate is 93.5%. The remaining calcium chloride solution is subjected to vacuum distillation and dehydration at a temperature of 150-180° C. and a vacuum degree of 0.09-0.095 MPa to evaporate the calcium chloride to dryness and apply it to the next batch.

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Abstract

The invention discloses a new method for formic acid purifying, which comprises the following steps: the aqueous solution of dilute formic acid with the mass concentration of more than 30 percent and anhydrous calcium chloride are mixed, heated to 80 to 95 DEG C so as to lead the anhydrous calcium chloride to be dissolved, and then formic acid with high concentration is obtained through atmospheric distillation; and the mass ratio of the water in the aqueous solution of calcium chloride anhydrous and the aqueous solution of dilute formic acid is 1: 1.5 to 1.8. The purifying method of formic acid is a process which has the advantages of simple and convenient operation, fastness, low cost and cleanness, thus being suitable for industrial production.

Description

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Claims

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Application Information

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Owner ZHEJIANG UNIV OF TECH
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