73 results about "Benzotrichloride" patented technology

The invention discloses a synthetic method of 2-hydroxy-4-methoxybenzophenone. The method comprises the following steps: condensing main raw materials comprising benzenyltrichloride and resorcinol, methylating, and purifying to obtain a final product. Compared with traditional synthetic methods, the synthetic method of 2-hydroxy-4-methoxybenzophenone has the advantages of reduction of Friedel-Crafts and hydrolysis reaction steps through primarily carrying out condensation, simple reaction technology and easy operation; the set of a feed ratio makes the reaction full and complete, so a largest yield is guaranteed; and the final product is obtained through filtering, re-crystallizing and purifying, the purity of the product can reach 95-98%, and the yield of the product can reach above 90%.

The invention discloses a benzoyl chloride and paraphthaloyl chloride co-production method. An acylating chlorination reaction is conducted under the action of a lewis acid catalyst with terephthalic acid and trichlorotoluene as raw materials, and paraphthaloyl chloride and benzoyl chloride are generated, wherein the catalyst is one or more of FeCl3, AlCl3, TiCl4 and tetrabutyl titanate, and the amount of the catalyst is 0.1-0.5% of the total mass of reactants; the molar ratio of the trichlorotoluene to the terephthalic acid is 2-3 to 1, the reaction temperature of the acylating chlorination reaction is 70-140 DEG C, and the reaction time is 2-6 hours. The benzoyl chloride is produced while the paraphthaloyl chloride is produced; the benzoyl chloride and paraphthaloyl chloride co-production method has the advantages that the raw materials are obtained easily, the reaction conditions are mild, safety is good, and the comprehensive production cost is low; the sulfur-containing raw material is not used in the new technology, micro sulphur does not exist in the paraphthaloyl chloride product, the inherent quality is high, and the para-aramid fiber production requirement can be met better.

The invention discloses a method for recycling trichlorotoluene and / or benzoyl chloride waste slag, which comprises the following steps: melting the waste slag by heating, distilling the obtained liquid material by vacuum heating to recycle trichlorotoluene and / or benzoyl chloride, absorbing the generated exhaust gas by a falling film absorption tower, and continuing heating the completely distilled material to perform coking, thereby obtaining the coked material with the carbon content of 98% or above; and adding water into the recycled trichlorotoluene and / or benzoyl chloride, heating while stirring, regulating the pH value to 7 or above with a sodium hydroxide solution, separating the solution, adding a hydrochloric acid solution into the supernate to regulate the pH value to 4.8-5.2, cooling to room temperature, and carrying out centrifugal separation to obtain benzoic acid. The method provided by the invention can effectively treat the waste slag and recycle the effective components in the waste slag, thereby enhancing the added value of the product and reducing the environmental pollution.

The invention provides a preparation method of an ultraviolet absorbent UV-9. The preparation method comprises following steps: step 1, water and methanol are added to a reaction kettle firstly, stirring is started, resorcinol is added, heating is performed, then benzotrichloride is dropwise added to the reaction kettle until the reaction is completed, mother liquor is subjected to centrifugal spin-drying, washing is performed until pH is neutral, and a UV-0 crude product is obtained; step 2, the UV-0 crude product, toluene and an acid-binding agent sodium carbonate are added to another reaction kettle, heating reflux is performed until no water drops appear, after cooling is performed, a catalyst PEG-400 is added, dimethyl sulfate is dropwise added, a mixture is heated after addition andsubjected to thermal insulation reaction until the components are reacted completely, water is added for washing, a product is left to stand for layering, organic phase is distilled under reduced pressure to remove an organic solvent methylbenzene, and a UV-9 crude product is obtained; step 3, the organic solvent is added to the UV-9 crude product for recrystallization, and a UV-9 finished productis obtained after centrifugation and drying. The problem of non-uniform color of the UV-9 product is solved, the product yield is increased, and the product cost is reduced.

The invention provides a synthesis method of 5-bromo-2-chloro benzoic acid.The method includes the following steps of A, making 2-chlorine benzotrichloride and bromide reagents react under the effect of a catalyst to obtain 2-chloro-5-bromine benzotrichloride, wherein bromide reagents include one or more of bromine, N-bromosuccinimide, dibromohydantoin and hydrobromic acid; B, conducting hydrolysis reaction on 2-chloro-5-bromine benzotrichloride in the step A under the acid condition to obtain 5-bromo-2-chloro benzoic acid.According to the method, 2-chlorine benzotrichloride which is low in price and easy to obtain is adopted as the raw material, operation is easy, intermediates do not need to be purified, 5-bromo-2-chloro benzoic acid is synthesized through a one-pot method, purity is high, yield is high, three-waste emission is little, and production cost is low.It is shown through experiment results that 2-chloro-5-benzoic acid obtained according to the synthesis method has yield larger than 95% and purity of 80-92%.

The invention belongs to the technical field of refinement of heavy liquid paraffin, and particularly discloses a technique and device for continuously refining heavy liquid paraffin. The main technical scheme is as follows: liquid paraffin, hydrogen chloride gas and softened water simultaneously and continuously enter a first-stage reaction tower, of which the height is 10 meters or so, to react; the softened water absorbs hydrogen chloride to be converted into hydrochloric acid; the hydrochloric acid is further subjected to chemical reaction with aromatic hydrocarbons, basic nitrogen and iron ions in the liquid paraffin to generate benzyl chloride, toluene dichloride, benzotrichloride, benzotrichloride, iron chloride, pyridinium, quinoline salt and the like with the specific gravity of greater than 1 g / ml, which are dissolved or mixed in the hydrochloric acid with the specific gravity of 1.16 g / ml; and thus, the substances with the specific gravity of greater than 1 g / ml can be separated from the clean liquid paraffin with the specific gravity of 0.8 g / ml. The device and method disclosed by the invention can be used for completely separating the impurities from the liquid paraffin, and more importantly, the closed circulating device has the characteristic of environmental protection.

The invention discloses a synthetic method of 2,3,6-trichlorotoluene. The invention provides the synthetic method of 2,3,6-trichlorotoluene, wherein the synthetic method includes the following steps: in the presence of a catalyst, 2,6-dichlorotoluene and a chlorination reagent are subjected to a chlorination reaction to obtain 2,3,6-trichlorotoluene, wherein the catalyst is a metal and / or a metal halide. The synthetic method has the advantages of simple preparation method, high yield, high selectivity, high purity of the prepared product, cheap and easy obtained raw materials and low production cost, and is suitable for industrialized production.

The invention discloses 2-substituent-4-methylsulfonyl-alpha,alpha,alpha-trichlorotoluene having a structure represented by formula (IV), and a preparation method and an application thereof. The preparation method comprises the following steps: adding 2-substituent-4-methylsulfonyltoluene having a structure represented by formula (II), an inert organic solvent and an acid binding agent into an autoclave, introducing chlorine, closing the autoclave, heating to 20-150DEG C for a reaction at 0.1-2MPa for 4-40h, and post-processing the obtained reaction solution after the reaction to obtain the above product (IV). The above compound (IV) can be used for synthesizing a triketone herbicide key intermediate 2-substituent-4-methylsulfonylbenzoyl chloride represented by formula (I). Compared with present 2-substituent-4-methylsulfonylbenzoyl chloride synthesis methods, the method has the advantages of short process route, few three wastes, low cost and the like.

The invention belongs to the technical field of refinement of heavy liquid paraffin, and particularly discloses a technique and device for continuously refining heavy liquid paraffin. The main technical scheme is as follows: liquid paraffin, hydrogen chloride gas and softened water simultaneously and continuously enter a first-stage reaction tower, of which the height is 10 meters or so, to react; the softened water absorbs hydrogen chloride to be converted into hydrochloric acid; the hydrochloric acid is further subjected to chemical reaction with aromatic hydrocarbons, basic nitrogen and iron ions in the liquid paraffin to generate benzyl chloride, toluene dichloride, benzotrichloride, benzotrichloride, iron chloride, pyridinium, quinoline salt and the like with the specific gravity of greater than 1 g / ml, which are dissolved or mixed in the hydrochloric acid with the specific gravity of 1.16 g / ml; and thus, the substances with the specific gravity of greater than 1 g / ml can be separated from the clean liquid paraffin with the specific gravity of 0.8 g / ml. The device and method disclosed by the invention can be used for completely separating the impurities from the liquid paraffin, and more importantly, the closed circulating device has the characteristic of environmental protection.

The invention relates to a preparation method of 4,4'-difluorobenzophenone, belonging to the field of chemical synthesis. The preparation method comprises the steps of carrying out acylation reaction on fluorine benzotrichloride and fluorobenzene under the catalysis of aluminum trichloride, and carrying out hydrolysis reaction, so as to obtain 4,4'-difluorobenzophenone. The preparation method of 4,4'-difluorobenzophenone has the beneficial effects of simple process, high yield, good selectivity and low cost.