43 results about "Chloral" patented technology

Use of a high shear mechanical device incorporated into a process for the production of chloral as a reactor device is capable of decreasing mass transfer limitations, thereby enhancing the chloral production process. A system for the production of chloral from acetaldehyde and chlorine, the system comprising a reactor and an external high shear device the outlet of which is fluidly connected to the inlet of the reactor; the high shear device capable of providing a dispersion of chlorine gas bubbles within a liquid, the bubbles having an average bubble diameter of less than about 100 μm.

The invention discloses a method for continuously synthesizing trichloracetic aldehyde and a device thereof. Ethanol and chlorine gas react through countercurrent contact, a reaction vessel consists of three stages of loop reaction vessels and one stage of filling material reaction vessel or a plate type reaction vessel, the mol ratio of the chlorine gas to the ethanol is 3.5 to 4.5 / 1, and the mol ratio of water to the ethanol is 0.6 to 1.5 / 1. The first stage of the reaction vessel has the temperature between 10 and 30 DEG C, the second stage of the reaction vessel has the temperature between50 and 75 DEG C, the third stage of the reaction vessel has the temperature between 80 and 95 DEG C, and the third stage of the reaction vessel has the temperature between 80 and 110 DEG C. The chlorine gas is introduced through the bottom of the second stage, the third stage and the fourth stage of the reaction vessels, tail chlorine of the second stage, the third stage and the fourth stage of the reaction vessels enters the first stage of the reaction vessel after being merged, the ethanol is added from the first stage of the reaction vessel, intermediate products of the reaction sequentially flow into a next stage of the reaction vessel, and the water is respectively added at different heights of the fourth stage of the reaction vessel. The method and the device have the advantages that the reaction yield and the equipment utilization rate are high, and the invention has good industrial application prospects.

The invention discloses the technical field of synthesis of isotope labeled compounds and particularly relates to a synthesis method of C13-labelled DDT (Dichlorodiphenyl Trichloroethane), DDD (Dichlorodiphenyl Dichloroethane) and DDE (Dichlorodiphenyl Dichloroethene). The synthesis method comprises the following steps: with 13C6-benzene as a raw material, carrying out oxychlorination to obtain 12C6-chlorobenzene, carrying out acid catalytic condensation on the 12C6-chlorobenzene with a trichloracetic aldehyde hydrate and a dichloroacetaldehyde hydrate respectively to obtain 13C12-DDT and 13C12-DDD, and preparing 13C12-DDE by carrying out catalytic dehydrochlorination on 13C12-DDT by means of a phase transfer catalyst. A series of representations prove that the products are 13C12-DDT, 13C12-DDD and 13C12-DDE, and the chemical purity of the products reaches above 90 percent, and the stable isotope abundance is above 90 percent.

The invention discloses a manufacturing method of a high temperature resistant printing rotary screen. The manufacturing method sequentially comprises the following steps of (1) preparing a die; (2) plating for the first time, and manufacturing a single screen; (3) preparing an additive, wherein the new additive is prepared from chloral hydrate for replacing saccharin sodium salt, 1,4-butynediol and deionized pure water; (4) plating for the second time, and adding the additive in the step (3) to a plating bath plated for the second time; and (5) processing a finished product. The manufacturing method has the advantages of simple step and convenience in operation, and a bath solution and the new additive are matched, so that the forming effect of the printing rotary screen is guaranteed, and the printing rotary screen has the characteristics of high temperature resistance, high rigidity, good toughness and durability; in addition, the new additive is prepared from the chloral hydrate for replacing the saccharin sodium salt, so that the brightness of the printing rotary screen is reduced, a frosted effect is generated, when plate making is performed on the printing rotary screen, the sizing is easy, and the phenomena of sticking and the like cannot occur.

The present invention relates to a kind of synthetic method of 2,3,5-trichloropyridine, it comprises the following steps: (1) under the condition that phase-transfer catalyst and polymerization inhibitor exist, chloral, acrylonitrile and catalyzer are in 60 Carry out chemical reaction at ~90°C to prepare the intermediate product 2,4,4-trichloro-4-formylbutyronitrile; (2) warm up the reaction solution obtained in step (1) to 60-100°C, and slowly pass Hydrogen chloride gas was added to carry out the ring closure reaction to prepare the target compound 2,3,5-trichloropyridine. By adopting the synthesis method of the present invention, the reaction conditions are mild and do not require harsh reaction conditions, such as high temperature, high pressure and reaction solvent, the catalyst can be recycled and used mechanically, the heavy metal pollution is less, the yield of the target product is high, reaching 80%, and the purity is high. 99%, the post-treatment of the product is simple, the cost is reduced, and it is suitable for industrial production.