Hypochlorous acid preparation device for preparing epoxide by monoacid chlorohydrin method and use method

A technology of epoxy and monoacid chlorohydrins, which is applied in chemical instruments and methods, chemical/physical processes, chemical/physical/physical chemical processes, etc., can solve the problems of inability to guarantee the balance of chlorine gas in the chlor-alkali industry, rising total product costs, Enterprise survival difficulties and other problems, to achieve the effect of complete recovery, reduce equipment investment, and less corrosion

Pending Publication Date: 2021-01-22
吴剑华
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the difficult-to-treat waste water and waste residues in the production of chlorohydrin method epoxides, it has become a bottleneck restricting the production of this method, which has caused the production of chlorohydrin method epoxides in my country to enter a dilemma. Turn off the environmentally unqualified chlorohydrin method. Epoxide manufacturers cannot guarantee the balance of chlorine gas in the chlor-alkali industry in a short period of time; ensuring that the waste water and waste residue in the production of epoxides by the chlorohydrin method can be treated in an environmentally friendly manner will increase the total cost of the product, reduce profit margins, and make it difficult for enterprises to survive

Method used

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  • Hypochlorous acid preparation device for preparing epoxide by monoacid chlorohydrin method and use method
  • Hypochlorous acid preparation device for preparing epoxide by monoacid chlorohydrin method and use method
  • Hypochlorous acid preparation device for preparing epoxide by monoacid chlorohydrin method and use method

Examples

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Embodiment 1

[0033]A hypochlorous acid preparation device for the production of epoxides by the single-acid chlorohydrin method described in this embodiment includes a hypochlorous acid reactor 1, a first gas-liquid separation device 2, a first carbon dioxide reactor 3, and a second gas-liquid Separation device 4, second carbon dioxide reactor 5, connecting pipelines between equipment, valves, medium delivery devices, control and display instruments and accessories; hypochlorous acid reactor 1, first carbon dioxide reactor 3, and second carbon dioxide reactor 5 are A heat-exchanging jacketed tubular reactor with chemical fillers provided continuously or intermittently; hypochlorous acid reactor 1 is provided with water, chlorine, sodium bicarbonate and circulating sodium bicarbonate inlets and the reactor reactant outlet, the first The gas-liquid separation device 2 is provided with a hypochlorous acid reactor 1 material inlet, a primary carbon dioxide outlet and a hydrogen chloride-free hy...

Embodiment 2

[0045] Embodiment 2 is substantially the same as Example 1, and the difference is that the second carbon dioxide reactor 5 is not provided with the device, and the sodium carbonate inlet of the first carbon dioxide reactor 3 is changed into an aqueous solution of sodium hydroxide inlet, and the aqueous solution of sodium hydroxide and Once carbon dioxide enters the first carbon dioxide reactor 3, sodium hydroxide reacts with carbon dioxide to generate sodium carbonate, and the process of sodium carbonate further reacting with carbon dioxide to generate sodium bicarbonate is carried out in the first carbon dioxide reactor 3. The secondary carbon dioxide outlet of the second gas-liquid separation device 4 is used as the non-condensable gas outlet.

[0046] The schematic diagram of the device in this embodiment is shown in figure 2 .

Embodiment 3

[0048] Embodiment 3 is substantially the same as Example 1, and the difference is that the device used is not provided with the second carbon dioxide reactor 5 and the second gas-liquid separation device 4, and adopts sodium carbonate aqueous solution in the first carbon dioxide reactor 3 with the first carbon dioxide reactor 3 from the first The primary carbon dioxide reaction of the gas-liquid separation device 2 generates sodium bicarbonate, and a part of the aqueous sodium bicarbonate solution from the first carbon dioxide reactor 3 enters the hypochlorous acid reactor 1 instead of adding sodium bicarbonate, and the other part is used to make commercial sodium bicarbonate .

[0049] The schematic diagram of the device in this embodiment is shown in image 3 .

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Abstract

The invention relates to a hypochlorous acid preparation device for preparing epoxide by a monoacid chlorohydrin method and a use method. Sodium bicarbonate is used for removing hydrogen chloride generated by reaction of water and chlorine in a hypochlorous acid reactor (1) to obtain hydrogen chloride-free hypochlorous acid, and a first carbon dioxide separation device (2) and a second carbon dioxide separation device (4) are arranged to separate carbon dioxide generated by removing hydrogen chloride; then, the generated carbon dioxide reacts with sodium hydroxide in a second carbon dioxide reactor (5) to generate sodium carbonate, the sodium carbonate further reacts with the carbon dioxide in a first carbon dioxide reactor (3) to generate sodium bicarbonate, and the generated sodium bicarbonate circularly enters a hypochlorous acid reactor (1) to remove hydrogen chloride generated by reaction of water and chlorine. The prepared hydrogen chloride-free hypochlorous acid is used for a subsequent chlorohydrination reaction, no byproduct chloropropane or chloroethane is generated, more chlorohydrins can be obtained, and the saponified target product epoxide is obviously higher than thetraditional epoxide production process in which hydrogen chloride participates in chlorohydrination.

Description

technical field [0001] The present invention relates to a preparation device for an intermediate product in the production process of a chemical product and a method for using the same, in particular to a device for preparing an intermediate product in the production process for a chemical product epoxide without hydrogen chloride hypochlorous acid and a method for using the same. Background technique [0002] Epoxide is an important chemical product, and its production methods include chlorohydrin method, co-oxidation method and hydrogen peroxide direct oxidation method (HPPO). In the early stage of epoxide production in my country, the chlorohydrin production process was mainly used to balance the chlorine produced in the chlor-alkali industry. Due to the difficult-to-treat waste water and waste residues in the production of chlorohydrin method epoxides, it has become a bottleneck restricting the production of this method, which has caused the production of chlorohydrin me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D301/26C07D303/02B01J19/00
CPCC07D301/26C07D303/02B01J19/00
Inventor 吴剑华
Owner 吴剑华
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