Adipic Acid Waste Oil Recovery and Utilization Method
An adipic acid and oil recovery technology, applied in chemical instruments and methods, preparation of carboxylic acid esters, preparation of ester groups and hydroxyl groups, etc., can solve problems such as waste of resources, complex tar components, and genetic defects, and achieve The effect of reducing environmental and personnel hazards, stable reaction process conditions, and reducing production costs
Active Publication Date: 2015-12-30
XINJIANG LAND FINE PETROCHEM
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Problems solved by technology
[0002]In the production process of alcohol and ketone, tar will be produced. The tar has complex components, dark color, high viscosity, low calorific value, and easy to coke, so it is not suitable for use as fuel oil; The by-product of dibasic acid monoester is produced in the dibasic acid ester unit. It is the residue after the purification of the dibasic acid ester. It has complex components, high boiling point, dark color, lower calorific value, and is easy to coke. It is not suitable for use as fuel oil.
The above two are collectively referred to as adipic acid waste oil. At present, the main treatment method of adipic acid waste oil is incineration, which not only pollutes the environment, but also causes waste of resources.
Moreover, adipic acid waste oil contains a large amount of hexavalent chromium ions, and hexavalent chromium is an ingestion poison / inhalation extremely poison, skin contact may cause sensitivity; it is more likely to cause hereditary genetic defects, and inhalation may cause cancer , a persistent hazard to the environment
In the early 1960s, the former Democratic Germany began to study the production of C4 to C6 dicarboxylic acids from adipic acid waste oil, but the industrialization was not ideal; in the early 1970s, Poland, the former Soviet Union and other countries also successively developed adipic acid waste oil after nitric acid oxidation. The process technology for preparing dicarboxylic acid and its dimethyl ester, but due to the large amount of nitric acid used and the violent reaction, it cannot be industrialized
So far, adipic acid waste oil from various domestic factories has not found a better way to use it
Method used
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Effect test
Embodiment 2
[0016] Example 2, the recycling method of adipic acid waste oil is carried out according to the following steps: the first step, the adipic acid waste oil and anhydrous methanol are mixed together according to the mass ratio of 1:0.4 or 1:2 to form the first mixture, while adding a composite catalyst whose mass is 0.5% or 2% of the mass of the mixture, and then carry out the esterification reaction at a temperature of 65°C or 80°C and a pressure of 0MPa or 0.3MPa for 4 hours or 6 hours, the esterification reaction After completion, the esterification reaction product is obtained; in the second step, the esterification reaction product is subjected to primary dehydration and dehydration for 4 hours or 7 hours at a temperature of 100°C or 120°C and a pressure of -0.01MPa or 0.01MPa. The methanol vapor and water vapor collected during the alcohol dehydration process are condensed to obtain methanol aqueous solution, and the second mixture is obtained after the initial dehydration ...
Embodiment 3
[0017] Embodiment 3, as a preference of the above embodiment, the operations of the first step, the third step, the fourth step and the sixth step are all carried out under stirring.
Embodiment 4
[0018] Embodiment 4, as a preference of the above embodiment, the stirring speeds of the first step, the third step, the fourth step and the sixth step are all 180r / min to 220r / min.
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The invention relates to the technical field of adipic acid waste oil recycling methods and discloses a method for recycling adipic acid waste oil. The method comprises the following steps: (1) mixing the adipic acid waste oil and anhydrous methanol together so as to form a first mixture, meanwhile, adding a composite catalyst into the first mixture, and then, carrying out esterification reaction, so as to obtain an esterification reaction product after the esterification reaction is completed; (2) carrying out first-time dealcoholization and dehydration on the esterification reaction product, and condensing methanol vapor and water vapor which are collected during the first-time dealcoholization and dehydration, thereby obtaining an aqueous solution of methanol. According to the method, the adipic acid waste oil can be recycled reasonably, the reaction process is stable in conditions, easy in control and simple in operation and is free from the occurrence of violent reactions, the waste can be changed into the valuable, and the economic benefit is further increased; during reaction, methanol can be utilized in a circulating manner, so that the production cost can be reduced greatly, and the economic benefit is increased; meanwhile, the toxicity of the waste oil can be reduced greatly, so that the harm to environment and personnel is lowered.
Description
technical field [0001] The invention relates to the technical field of a method for recycling adipic acid waste oil, and relates to a method for recycling adipic acid waste oil. Background technique [0002] During the production of alcohol and ketone, tar will be produced. The tar has complex components, dark color, high viscosity, low calorific value, and is easy to coke. To purify the residue after the dibasic acid ester, it has complex components, high boiling point, dark color, lower calorific value, and easy coking, so it is not suitable for use as fuel oil. The above two are collectively referred to as adipic acid waste oil. At present, the main treatment method of adipic acid waste oil is incineration, which not only pollutes the environment, but also causes waste of resources. Moreover, adipic acid waste oil contains a large amount of hexavalent chromium ions, and hexavalent chromium is an ingestion poison / inhalation extremely poison, skin contact may cause sensiti...
Claims
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IPC IPC(8): C07C67/08C07C67/03C07C69/24C07C69/40C07C69/42C07C69/44C09D7/12
CPCC07C67/03C07C67/08C07C69/24C07C69/40C07C69/42C07C69/44C09D7/20
Inventor 陈科苏杰张士博罗修文周军王晓刚陈进明
Owner XINJIANG LAND FINE PETROCHEM