Device and method for continuous production of benzoic acid and by-product benzaldehyde
A technology of benzaldehyde and benzoic acid is applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, preparation of carboxylate salts, etc. Can not efficiently by-produce benzaldehyde and other problems
Active Publication Date: 2017-12-29
HUNAN HONGRUN CHEM TECH CO LTD
View PDF1 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The continuous production process of benzoic acid and its equipment cannot efficiently by-produce benzaldehyde; the heat recovery efficiency of the oxidation unit is not high, and the production capacity of a single set of equipment cannot be raised
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0042] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific implementations disclosed below.
[0043] see figure 1 , the device of the continuous production of benzoic acid of one embodiment, by-product benzaldehyde, comprises oxidation device 10, toluene distillation tower 20, removes low boiling tower 30, benzoic acid rectification tower 40, benzaldehyde lightening tower 50 a...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a device for continuously producing benzoic acid and byproduct benzaldehyde. The device comprises an oxidization device, a methylbenzene distillation column communicated with the bottom of the oxidization device, a low-boiler removal column communicated with the bottom of the methylbenzene distillation column, a benzoic acid rectifying column communicated with the bottom of the low-boiler removal column, a benzaldehyde low boiling fraction removal column communicated with the top of the low boiling fraction removal column, and a benzaldehyde rectifying column communicated with the bottom of the benzaldehyde low boiling fraction removal column. The oxidization device is used for the continuous reaction of methylbenzene and air under the effect of a catalyst, and tail gas and oxidized liquid are formed. The invention further provides a method for continuously producing benzoic acid and byproduct benzaldehyde. By means of the device and method, methylbenzene and air continuously react under the effect of the catalyst, after the oxidized liquid is subjected to a series of distillation and rectification operations, finished benzoic acid is efficiently obtained, and meanwhile finished byproduct benzaldehyde is obtained. The content of benzoic acid in the finished benzoic acid is 99% or above, and the content of benzaldehyde in the finished benzaldehyde is 99.8% or above.
Description
technical field [0001] The invention relates to the field of chemical industry, in particular to a device and a method for continuously producing benzoic acid and by-product benzaldehyde. Background technique [0002] Benzoic acid is a chemical product with a wide range of uses. At present, toluene liquid-phase air oxidation method is mostly used in industry to produce benzoic acid intermittently. This method has high labor intensity, high energy consumption and unstable product quality. [0003] CN201310554365.4 discloses a continuous production process for benzoic acid, comprising the following steps: (1) feeding toluene liquid and catalyst; (2) feeding air, and the air and toluene liquid react under the action of catalyst; (3) controlling temperature; (4) benzoic acid discharge, while discharging, the feed inlet of the reaction tower is charged to realize continuous reaction. The equipment used in this process includes a reaction tower, a cooling device, an oil-water se...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/265C07C51/44C07C63/06C07C45/36C07C45/82C07C47/54C07C27/12
CPCC07C45/36C07C45/82C07C51/265C07C51/44C07C63/06C07C47/54
Inventor 倪杰赵立群周宇杨代萍王凌宁
Owner HUNAN HONGRUN CHEM TECH CO LTD