Adopting the benzoic acid that contains sodium chloride is the method for raw material production methyl benzoate
A technology of methyl benzoate and benzoic acid, applied in the field of producing methyl benzoate, can solve problems such as affecting the service life of equipment, increasing production costs, losing catalytic effect, etc., and achieves reduction of chemical oxygen demand, production cost reduction, reduction effect of dosage
Active Publication Date: 2016-07-13
ANHUI JIAXIAN FUNCTIONAL AUXILIARY
View PDF2 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The process of producing dibenzoylmethane is divided into condensation, pickling, alkali washing, water washing, concentration, crystallization and other processes. In the pickling process, some methyl benzoate will be hydrolyzed to produce benzoic acid. During alkali washing, benzoic acid and The alkali reacts to produce sodium benzoate. When the separated sodium benzoate is neutralized with hydrochloric acid to recover benzoic acid, the filtered benzoic acid contains part of brine. When the recovered benzoic acid is used to produce methyl benzoate, sodium chloride poisons the catalyst , that is, p-toluenesulfonic acid generates its salt (sodium p-toluenesulfonate), which makes it lose its catalytic effect. Therefore, a large amount of p-toluenesulfonic acid is consumed in the actual production process, which greatly increases the production cost and produces a lot of danger. waste
If only concentrated sulfuric acid is used as a catalyst, the amount of sulfuric acid will be large, and serious corrosion will occur, and a large amount of alkali will be used for neutralization, which will affect the service life of the equipment and increase the production cost
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 moreExamples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0014] The invention provides a kind of method that adopts the benzoic acid that contains sodium chloride to be raw material production methyl benzoate, comprises the following steps:
[0015] (1) Put 1,000 kg of benzoic acid recovered containing sodium chloride into a reaction kettle with 500 kg of methanol added in advance, add 25-100 kg of p-toluenesulfonic acid and 5-20 kg of concentrated sulfuric acid, heat up to 100°C, and start dripping continuously Add methanol and keep it warm for 4 hours to make the reaction continue. The dropping rate is 150-300L / h. Keep the methanol reaction in excess. The methyl benzoate enters the receiving tank, and then carries out alkali washing, water washing and dehydration steps to obtain the finished product methyl benzoate.
[0016] （ 2) Add 500 kg of methanol, 1000 kg of sodium chloride-containing benzoic acid and 10 kg of concentrated sulfuric acid to the residue at the bottom of the still bottom after the methyl benzoate has been evap...
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 present invention publicly uses a phenolic acid containing sodium chloride as a raw material to produce benzolate. It mixes the sodium chloride -containing by -products with excess methanol in the ester kettle. At the same time, an organic catalyst and inorganic catalyst are added.Stir while heating. When the temperature rises to 100 ° C, heats up and adds methanol for 4 hours, keep the methanol reaction overdose. After the drip is stopped, the methanol is distilled first, and then the benzoic acid methyl ester is distilled.The dehydration is obtained by the finished benzoate. The present invention uses the combination of two catalysts: organic and inorganic catalysts. The amount of organic catalysts accounts for only 5‑10%of the original single catalyst.The income of benzoate is further increased, no hazardous waste is generated, and the cost of dealing with hazardous waste is reduced.
Description
technical field [0001] The invention relates to a method for producing methyl benzoate by recycling benzoic acid, a by-product in the production process of chemical products. In particular, a method for the recovery and utilization of by-product benzoic acid containing sodium chloride to produce methyl benzoate is provided, which is especially suitable for the production of benzoic acid (containing sodium chloride) as a by-product in the process of dibenzoylmethane Recycling to produce methyl benzoate. Background technique [0002] Benzoic acid is also known as benzoic acid. Benzoic acid is generally used as a medicine or preservative to inhibit the growth of fungi, bacteria, and mold. It is usually applied on the skin when it is used as medicine to treat skin diseases such as ringworm. Used in synthetic fiber, resin, paint, rubber, tobacco industry. [0003] In the production process, if the by-product benzoic acid is not recycled, it will have a serious negative impact o...
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): C07C67/08C07C69/78
CPCC07C67/08C07C67/48C07C69/78
Inventor 李兑黄先胜魏长亭朱明杰李海江刘剡剀
Owner ANHUI JIAXIAN FUNCTIONAL AUXILIARY