Method for preparing formic acid by acidifying sodium formate with acidification adjuvant
A technology of sodium formate and additives, which is applied in the field of formic acid preparation, can solve the problems of formic acid quality decline, lower formic acid concentration, and many by-products, and achieve the effects of reducing production costs, optimizing the operating environment, and facilitating operation
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Embodiment 1
[0019] Embodiment 1: in reactor, add anhydrous sodium formate, add the pentane of 40-60 ℃ of boiling range 40-60 ℃ of sodium formate charging amount 6%, meter the sulfuric acid that adds 98%, reaction heat is taken out reactor by pentane gasification, The temperature is lowered by 10-20°C cooling water, and then returned to the reactor after condensation. When the metered 98% sulfuric acid drop rate is controlled for 1-2 hours, continue to react for 20-30 minutes after adding, until there is no back distillation, the solvent is distilled off at 80°C, and the late stage is steamed in a low vacuum until the formic acid is distilled, and the recovered ammonium Alkane and a small amount of formic acid are used for the next batch of sodium formate acidification reaction, and the solvent recovery rate is greater than 96%. The formic acid is distilled out of the reaction material after the solvent is removed under an absolute pressure of 0.03-0.04 MPa, the formic acid content is grea...
Embodiment 2
[0020] Embodiment 2: In the reactor, add anhydrous sodium formate, add the cyclopentane of sodium formate charging amount 6%, meter and add 100% phosphoric acid (available 85% phosphoric acid and the superphosphoric acid mixing preparation of 105%) react at 60 ± 5 ℃ , the heat of reaction is taken out of the reactor by cyclopentane vaporization, cooled by 10-20°C cooling water, and returned to the reactor after condensation. The 100% phosphoric acid addition rate is controlled for 1-2 hours, and the reaction is continued for 20-30 minutes after the addition is completed. Upright without back distillation, solvent is distilled at 80°C, low vacuum is used to distill formic acid in the later stage, cyclopentane and a small amount of formic acid are recovered, and used for the next batch of sodium formate acidification reaction, the solvent recovery rate is greater than 96%, and the solvent is completely removed. The formic acid is distilled from the material under an absolute pres...
Embodiment 3
[0021] Embodiment 3: in reactor, add anhydrous sodium formate, add sodium formate charging amount 8% isopropyl ether, meter and add 100% phosphoric acid, react below 80 ℃, reaction heat is taken out reactor by isopropyl ether vaporization, by 20 ℃ Cooling water to cool down, return to the reactor after condensation, 100% phosphoric acid drop rate is controlled for 1-2 hours, continue to react for 20-30 minutes after the addition, stand upright without back distillation, distill isopropyl ether below 80 ℃, and later in Distill a small amount of isopropyl ether under 50MPa absolute pressure until the formic acid is distilled, and recover the isopropyl ether for the next reaction. The solvent recovery rate is greater than 96%. After the solvent is removed, the reaction material is distilled under 0.03-0.04MPa absolute pressure. Formic acid, the formic acid content is greater than 96%, and the yield is greater than 98%.
PUM
| Property | Measurement | Unit |
|---|---|---|
| boiling point | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More