Information on diketone, what are the manufacturers that produce diketone

Molecular formula C4H6O2, structural formula CH3Co-Coch3, molecular weight. Also known as diketone or 2,3-butanedione, yellow oily liquid with benzoquinone odor, dilute solution with cream odor, present in fennel oil and cream. Melting point -3 -4, boiling point 88 91, density (15 15), soluble in water, miscible with ethanol and ether.

It can be reduced to butylene glycol. It reacts with two molecules to form diketone oxime, which is an important reagent for the identification of nickel ions. It is mainly used as a flavor enhancer for cream, margarine, cheese and candy, and a hardener for gelatin.

Vinylacetylene can be passed into a mercury sulfate solution, and then hydrolyzed with hydrochloric acid treatment.

There are more than 10 domestic manufacturers of double B, but most of them are mainly self-produced and self-used, at present, only Suzhou Haobo Technology Co., Ltd. is mainly exported to biketone, and the current domestic manufacturers are: Suzhou Haobo Technology Co., Ltd., Nantong Acetic Acid Company, Jiangyan Yangtze River Chemical Plant, Wuhan Pharmaceutical Factory, Jiangsu Xinghua Chemical Fertilizer Factory, Shandong Xinhua Pharmaceutical Factory, Hubei Guangji Pharmaceutical, Shandong Jiaozhou Huanghai Chemical Company, Shandong Zibo Pharmaceutical Chemical Plant, etc. In terms of quality, it may be better than Suzhou Haobo, and I heard that 99% of the content in the previous life was **.

Diketene ** is temporarily oversupplied, but the future development may occur in the following situations: first, due to the surplus of the industry, reshuffle the cards, wash out the backward manufacturers of technical grinding limb management, and then regain vitality; The second is natural elimination, which refers to the fact that due to safety accidents to the factory to repent, 20 years ago, Shanghai Pengpu Chemical Plant, Anhui Bayi Chemical and Guangxi Nanning all produced diketone, but later because of the large ** to half or even the entire factory became flat, at present, many manufacturers blindly intervene may suffer safety losses in the future.

I heard that Suzhou Haobo Co., Ltd. has more than 10 blind cover production lines, with an annual output of more than 40,000 tons. It seems that they are still professional, we did it earlier than them, but unfortunately we have to buy it from them now. And I heard that they have 99% diketone, I don't know if it's true or not.

Suzhou Zhangjiagang has the largest production volume, and the amount of his own use is very small, and the stools are mainly sold, and the other hail is a little bit sold out after they can't use it up, and the quality is not as good as the Zhangjiagang one.

Ketene is an organic compound, is the simplest alkene, the molecular formula is CH2=C=O, it is a toxic gas at room temperature, it is very unstable, it can only be stored at low temperatures, and the polymerization reaction can occur at 0 to generate dimer ketone. The two bonds in ketene are orthogonal, the chemical properties are very active, and can be added with many substances containing active hydrogen, which is an important intermediate in organic synthesis.

Chinese name: ketone.

English name: ethenone

Chemical formula: C2H2O

Molecular Weight: CAS accession number: 463-51-4

Boiling point : -56

Water solubility : soluble in water (reacts with water).

Application: Organic synthesis.

Safety description: Extremely flammable, reacts with air to form ** peroxide.

Molecular formula, physical properties, chemical properties, preparation method, the simplest alkene, whose molecular formula is ch2=c=o. It is an important organic intermediate, and enone refers to a compound containing atomic clusters >> c=c=o in the molecule. Ketene is a colorless gas; Has a **sexual odor similar to chlorine and acetic anhydride; Toxic, inhaled will cause a severe headache; Can be liquefied into colorless liquid; Melting point -151, boiling point 56.

Pure ketone is extremely unstable and must be stored at low temperature (80), and polymerized (see polymerization reaction) into dimer ketone at room temperature. This polymer is a liquid with a sexual odor, melting point, boiling point; It reacts with ethanol to form ethyl acetoacetate. Ketene reacts with bromine to form bromoacetyl bromide; It reacts with water, liquid ammonia, ethanol, acetic acid, and metal-organic compounds to form acetic acid, acetamide, ethyl acetate, acetic anhydride, and ketones, respectively.

Ketene reaction formulaA common method for preparing ketene is to pass acetone vapor into a tube at a temperature of 650 800C to thermally decompose it to produce ketone and methane. In the presence of trace amounts of triethyl phosphate, acetohydrate can lose water to form ketone at a pressure of 100 400 mm Hg and a temperature of 700 800. The mixture of acetylene and oxygen (molar ratio 2 1) is kept at a temperature of 98 107 and stays on the Zno Cao ago catalyst with silicone as the carrier for one second, and the ketene can be directly generated by trapping the company.

Ketene is mainly used in the synthesis of basic chemical raw materials and reagents.

It can be used as an organic raw material, and can be used as a raw material for plasticizers, dyes, synthetic fibers and pesticides. : Ethyl acetoacetate, methyl acetoacetate, tert-butyl acetoacetate, isobutyl acetoacetate, 1-phenyl-3-methyl-5-pyrazolidone, chloroacetyl chloride, acetoacetyl o-chloroaniline, acetylacetyl-o-methoxyaniline, bis-acetylethanolamine, acetyl acetylmethylamine, 1,3-butanediolamine, -acetyl--butyrolactone, ethyl-chloroacetoacetate, p-toluenylpyrazolone, n-acetolacetanilide.

Ketene is an important intermediate of pesticides and medicines, which can be used to prepare fungicides such as seed dressing, wosakilamine, rust, dimethylpyrifol, ethyl phenol, insecticides monocrotophos, phosphine, fly phosphine, amine phosphine, pyrimidine phosphorus, diazine phosphorus, myxacarb, anti-aphidcarb, dimethoate, oxymethoate, herbicides alachlor, acetochlor, butachlor, quinoxalin, toxachlor, saxifos, etc.

1.Ethylene ketene has a strong reactivity ability and can derive a variety of products, and is a raw material for fine chemical dyes, pharmaceuticals, pesticides, food and feed additives, additives, etc. The acetylacetyldiethylamine obtained by the reaction of dienytone and diethylamine is an intermediate of the organophosphorus insecticide phosphramine; The acetyl acetylmethylamine obtained by reaction with monomethylamine is an intermediate of monocrotophos.

Dienone reacts with ammonia to form acetylacetamide, which is used in the synthesis of dyes and repentant intermediates 1-(4-chlorophenyl)-3-methyl-5-pyrazolone, 1-(4-sulfonylphenyl)-3-methyl-5-pyrazolone; Dienone reacts with ethanol to form ethyl acetoacetate, which is used in the synthesis of dye intermediates 1-phenyl-3-methyl-5-pyrazolone, 1-(2,5-dichloro-4-sulfonylphenyl)-3-methyl-5-pyrazolone, etc. From these intermediates, dye permanent yellow G, acidic medium jujube red BN, neutral orange RL, neutral brown 5RL, neutral dark brown BRL, acidic yellow G, weak acid yellow G, acidic yellow 2g, active yellow K-6g, active yellow M-5g, active yellow X-6g, neutral pink BL, etc. 1-phenyl-3-methyl-5-pyrazolone and its derivatives are more used in the production of antipyretic and analgesic drugs antipyrine, aminopyrine, analgin, etc.

Dienone can also be used in the synthesis of amino acids. Dienone, o-nitroaniline and ethanolamine are used as raw materials to prepare feed additive quinethanol (fast Yuling). Dienone is used in the synthesis of a variety of heterocyclic compounds, such as synthetic pyrrole derivatives, isoxazole derivatives, pyrazolone derivatives, pyrimidine derivatives, thiazole derivatives, quinoline compounds, coumarin compounds, furan derivatives; Dienone can also react with a series of compounds to produce pyrones, pyridones, dioxanes, oxazines and flavonoids.

2.used as pharmaceutical intermediates, food preservatives, pigments and pre- or conditioning agents.