Method for preparing formic acid

A technology of formic acid and methyl formate, which is applied in the field of formic acid preparation, can solve the problems of high energy consumption, long process, and easy reverse esterification reaction, etc., and achieve low energy consumption, short process, and effective control of reverse esterification reaction Effect

Active Publication Date: 2008-02-20
SOUTHWEST RES & DESIGN INST OF CHEM IND
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Problems solved by technology

[0009] Obviously, the above-mentioned methods all have disadvantages such as long flow process, high energy consumption, and easy occurrence of reverse esterification reaction to varying degrees.

Method used

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  • Method for preparing formic acid
  • Method for preparing formic acid

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Experimental program
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Embodiment 1

[0032] The present embodiment is the preparation method of high-purity formic acid, and its technological process is as shown in Figure 1, mainly comprises the following steps:

[0033] (1), hydrolysis reaction: make raw material water and methyl formate hydrolyze in the hydrolysis system (not drawn in Fig. 1), generate the hydrolysis mixture 1 containing water, formic acid, methyl alcohol and excess methyl formate;

[0034](2), pressurized distillation and separation: the hydrolysis mixture 1 containing water, formic acid, methanol and excess methyl formate obtained in the hydrolysis reaction of step (1) is introduced into the middle part of the first distillation tower 19;

[0035] This hydrolysis mixture 1 flow rate is 18087kg / h, wherein methyl formate 8124kg / h, methyl alcohol 2233kg / h, water 5319kg / h, formic acid 2411kg / h; This first distillation tower 19 is a tray tower, operating pressure 0.13MPa (G) , the tower top temperature is 109°C, the reflux ratio R=1.2;

[0036]...

Embodiment 2

[0045] What this embodiment is different from embodiment 1 is: do not use the second distillation tower, the first distillation tower still liquid directly as the formic acid product of 85% (wt), also do not have the second distillation tower still liquid to enter in the first distillation tower simultaneously lower part.

[0046] The operating conditions of the first distillation column are the same as in Example 1, and the feed 1 of the hydrolyzed mixture of the first distillation column 19 is the same as in Example 1.

[0047] The first distillation tower still liquid 10 of the present embodiment contains: water 407.7kg / h, formic acid 2504.4kg / h, add up to 2912.1kg / h, formic acid concentration 86.0% (wt);

[0048] In this embodiment, the production liquid 5 at the top of the first distillation tower contains: water 4874.7kg / h, methyl formate 8002.1kg / h, methanol 2298kg / h, a total of 15174.8kg / h.

[0049] Can get by calculating: formic acid rate of recovery: 103.87%, formic...

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Abstract

The invention discloses a preparation method of methanoic acid, main steps of which are that: (1) compound containing water, methanoic acid, methanol and methyl formate is produced by hydrolyzing methyl formate; (2) methanol, water and methyl formate are separated from the compound containing water, methanoic acid, methanol and methyl formate by pressurizing and distilling, and then methanoic acid containing water is taken out of tower bottom. The method for preparing methanoic acid can effectively prevent reversing esterification, increase hydrolyzing reaction, reduce recycle ratio of materiel, improve manufacturing ability of hydrolyzing system equipment and greatly decrease energy consumption.

Description

technical field [0001] The invention relates to a method for preparing formic acid, which belongs to the technical field of chemical industry. Background technique [0002] At present, among the preparation methods of formic acid, the latest industrial-scale preparation methods all use methyl formate as starting material (methyl formate can be easily prepared by methods such as methanol carbonylation or methanol dehydrogenation), so that methyl formate Hydrolysis occurs under acid catalysis (generally using product formic acid self-catalysis), and the reaction formula is as follows: [0003] <chemistry num="0001"> <chem file="200710050154_CML001.XML" / > < / chemistry> [0004] Above-mentioned reaction is a reversible reaction, because hydrolysis and esterification all obtain catalysis, so methyl formate hydrolysis obtains a high ratio mixture of four components of methyl formate, water, formic acid and methyl alcohol. Since the boiling points of the prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C27/02C07C53/02
Inventor 林必华胡文励彭奕汤洪杨松谢萍
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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