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Treatment method of acrolein production residual liquid
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A treatment method and technology of acrolein, applied in carboxylate preparation, organic chemistry, etc., can solve the problem of high treatment cost and achieve the effect of cost reduction
Active Publication Date: 2013-12-11
重庆紫光合盛建材有限公司
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It takes 200-300m3 to incinerate 1 ton of low-concentration acrylic acid aqueous solution 3 Natural gas, the processing cost is high, and according to the current technical level of industrial acrolein catalysts, 1-3 tons of low-concentration acrylic ac
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Embodiment 1
[0036] In a 1000ml three-necked flask, add 800ml of acrolein-producing tail liquid (containing 5% acrylic acid), and under the condition of slow stirring, dropwise add 40g of 40% sodium hydroxide aqueous solution, and keep the temperature of the system ≤40℃ during the dropwise addition, After the dropwise addition, the temperature of the system was lowered to 30°C, 14g of 15% sodium hydroxide aqueous solution was added dropwise, then the temperature was raised to 60°C and kept for 1 hour. Dry in a vacuum oven at 70°C for 12h to obtain a white solid of sodium acrylate.
[0037] The sodium acrylate solid obtained in Example 1 was tested by gel permeation chromatography, and the obtained results are shown in Table 1.
Embodiment 2
[0039] In a 1000ml three-necked flask, add 800ml of the tail liquid of acrolein production (containing 5% acrylic acid), and under the condition of slow stirring, add 65g of 30% sodium hydroxide aqueous solution dropwise, and keep the temperature of the system ≤ 40 ℃ during the dropwise addition, After the dropwise addition, the temperature of the system was lowered to 30°C, 20g of 10% sodium hydroxide aqueous solution was added dropwise, then the temperature was raised to 60°C and kept for 1 hour. Dry in a vacuum oven at 70°C for 12h to obtain a white solid of sodium acrylate.
[0040] The sodium acrylate solid obtained in Example 2 was tested using gel permeation chromatography, and the obtained results are shown in Table 1.
Embodiment 3
[0042] In a 1000ml three-necked flask, add 800ml of the tail liquid of acrolein production (containing 7% acrylic acid), and under the condition of slow stirring, add 60g of 50% sodium hydroxide aqueous solution dropwise, keep the temperature of the system ≤ 40 ℃ during the dropwise addition, After the dropwise addition, the temperature of the system was lowered to 30°C, 12g of 10% sodium hydroxide aqueous solution was added dropwise, then the temperature was raised to 60°C and kept for 1 hour. Dry in a vacuum oven at 70°C for 12h to obtain a white solid of sodium acrylate.
[0043]The sodium acrylate solid obtained in Example 3 was tested by gel permeation chromatography, and the obtained results are shown in Table 1.
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Abstract
The invention provides a treatment method of an acrolein production residual liquid. The treatment method comprises the following steps: adding a first alkaline liquid into the acrolein production residual liquid under the condition of stirring to neutralize the residual liquid, cooling a reaction system, then, adding a second alkaline liquid, heating and reacting to obtain sodium acrylate. Compared with the prior art, the treatment method has the advantages that the sodium acrylate is prepared from the acrolein production residual liquid, and the acrolein production residual liquid contains 3-9% of acrylic acid with relatively low concentration, therefore, when the acrolein production residual liquid is mixed with the alkaline liquids for reacting, polymerization and other side reactions can be avoided; meanwhile, the sodium acrylate obtained after the reaction is ended can be separated from water by using a common distillation method, so that the treatment cost of the acrolein production residual liquid is reduced, and the aim of comprehensive utilization can also be achieved; and in addition, acrolein contained in the residual liquid is extremely easy to oxidize to generate the acrylic acid under an alkaline condition in the existence of a small amount of oxygen in a solution, so that the quality of the product is ensured.
Description
technical field [0001] The invention belongs to the technical field of fine chemicals, and in particular relates to a method for processing tail liquor of acrolein. Background technique [0002] Acrolein, also known as allylaldehyde, is mainly used in the preparation of animal feed additive methionine, the production of pesticide insecticide imidacloprid; antitumor drug 2,3-dibromoacrolein; fungicide glutaraldehyde; acrolein can be oxidized to produce acrylic acid, Acrylate can be further synthesized and reduced to produce propanol, which is an important intermediate for the synthesis of glycerol, spices and medicines, spices and medicines, allyl thiourea, and allyl isothiocyanate. The synthesis methods of acrolein are mainly divided into three categories: condensation method (formaldehyde-acetaldehyde gas-phase condensation method, aldol condensation method), decomposition method (glycerol dehydration method, propylene ether pyrolysis method) and oxidation method (propylene...
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