49results about How to "Reaction process cleaning" patented technology

A catalyst carrying ionic liquid and metallic nanoparticles for preparing high-quality arylamine by hydrocatalyzing aromatic nitro compound is prepared through preparing immobilized ionic liquid by bonding the ionic liquid onto carrier, binding it with the active component containing transition metal or precursor, and reductive exchange. Its advantages are low reaction temp, long service life and no waste generation.

The invention provides a method for preparing copper iodide P-type transparent semi-conductor thin film material at room temperature and relates to a preparation method of the copper iodide P-type transparent semi-conductor thin film material. The method aims to overcome the defects of the high reaction temperature, complex equipment operation and long reaction time existing in an existing physical method universally, and solve the problem that the electrical property and the optical property of copper iodide thin films prepared through traditional copper film one-time iodization film formingare low. The method for preparing the copper iodide P-type transparent semi-conductor thin film material at the room temperature is completed through the steps of washing a target material and a substrate, preparing a Cu thin film, preparing a single-layer CuI thin film, and preparing a CuI composite thin film circularly.

The invention provides a method for synthesizing para aminophenylmethylether by catalytic hydrogenation paranitroanisole. In the method, the paranitroanisole is subjected to catalytic reduction reaction with hydrogen to generate the para aminophenylmethylether in the presence of a load type palladium catalyst in a supercritical carbon dioxide reaction medium under mild conditions. Compared with the traditional processes, such as a nitrobenzene method, a sodium sulfide or ferrum reduction method, a method for synthesizing the para aminophenylmethylether by reducing the paranitroanisole by activated carbon load type palladium catalyst hydrazine hydrate, and the like, the invention has the advantages of mild reaction condition, fast reaction, clean reaction process and easy product separation, achieving the product yield more than 99 percent, and the like; in addition, in the invention, reaction temperature is reduced from 75-125 DEG C in the nitrobenzene method to 50-80 DEG C, and reaction time is reduced from 130 minutes in the method for synthesizing the para aminophenylmethylether by reducing the paranitroanisole by the activated carbon load type palladium catalyst hydrazine hydrate to 10-30 minutes without adding any organic solvent and additive or generating any side products in the reaction process.

A process for synthesizing the symmetric arylurea compound features that the aromatic nitro compound takes part in carbonylation reaction in organic solvent under existance of CO, Se powder as catalyst and alkali as cocatalyst to obtani target produst. The Se powder is then oxidized by O2 or air for separating it out and reusing it.

The novel process of hydrogenating benzoic acid to synthesize cyclohexyl formic acid includes the catalytic cyclization reaction of benzoic acid via contact with hydrogen inside supercritical CO2 and cyclohexyl formic acid without solvent in the presence of metal rhodium catalyst and under mild reaction condition; and subsequent extraction to separate product from the catalyst by means of the dissolubility of cyclohexyl formic acid in supercritical CO2. The technological process of the present invention has the advantages of mild reaction condition, clean reaction process, no side product and waste, no need of post-separation, and high product yield and quality.

The invention relates to a method for synthesizing ethyl methyl carbonate, and concretely relates to a method for one-step synthesis of ethyl methyl carbonate from propylene oxide and co-production of1,2-propanediol. An efficient alkaline catalyst having a compopsite pore structure is used in the one-step reaction of the propylene oxide, carbon dioxide, methanol and ethanol for synthesizing the ethyl methyl carbonate. A crude product obtained through the reaction contains dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate and 1,2-propanediol, wherein the ethyl methyl carbonate selectivity reaches up to 70%. Byproducts dimethyl carbonate and diethyl carbonate can be directly separated as products, also can be recycled, and are continuously reacted to generate the ethyl methyl carbonate, and the product 1,2-propanediol can be separated through simple distillation as a popular raw material. The method has the advantages of cleanness, high efficiency, no pollution and no wastesin the whole reaction process. The catalyst is not inactive after being used at a molar ratio of the propylene oxide to the carbon dioxide to the methanol to the ethanol of 1:1:3:2 under a reaction pressure of 5 MPa at a reaction temperature of 100 DEG C under an air speed of 5 h<-1> for 5000 h, and has a good stability.

The invention discloses a method for preparing benzaldehyde by catalytically oxidizing phenylcarbinol through Pt / BiOCl-metal oxide serving as a catalyst. The method comprises the following steps: by taking a noble metal Pt / BiOCl-metal oxide compound system as the catalyst, dispersing phenylcarbinol and the catalyst into water, and continuously stirring under a relatively low-temperature dark condition for 3 to 10 hours, wherein the generation selectivity of the benzaldehyde can be 99 percent or above, and the yield of the benzaldehyde is retained within a range of 80 to 100 percent according to different types of carriers. The method has the following active effects that 1, the reaction can be carried out at relatively low temperature, such as room temperature of 25 DEG C; 2, low-cost air is used as an oxidant, so that the problem of environmental pollution caused by the fact that a high-cost metal such as chromium and manganese is used as the oxidant is solved; 3, no alkaline substances serving as an auxiliary catalyst are added into a reaction system; 4, basically no side effect is caused in a reaction process, and the generation selectivity of the benzaldehyde is retained at 99 percent or above; 5, equipment devices for reaction and an operation process are simple.

The invention relates to a method for one-step synthesis of a carbonic acid symmetric ester and co-production of 1,2-propanediol through propylene oxide, and relates to a method for synthesizing a carbonic acid symmetric ester. According to the present invention, the method is used for one-step synthesis of carbonic acid symmetric esters through propylene oxide, carbon dioxide and various alcohols(ROH can be a linear alcohol, an isomeric alcohol, an aromatic alcohol, a phenol, a diol such as 1,2-propylene glycol and diethylene glycol, polyol and various alcohols), the crude products obtainedthrough the reaction contain only the carbonic acid symmetric ester and the 1,2-propanediol, the selectivity of the carbonic acid symmetric ester can be up to 95%, and the by-product 1,2-propanediol as the bulk material can be separated through simple distillation, such that the whole reaction process is clean, efficient and non-polluting, and does not produce any waste; and the catalyst is not deactivated for 5000 h at the reaction temperature of 100 DEG C under the reaction pressure of 5 MPa at the space velocity of 5 h<-1> according to the molar ratio of propylene oxide to carbon dioxide tovarious alcohols of 1:1:3 so as to achieve good stability.

The invention provides a preparation method for a composition of 2,4-dichlorophenoxyacetic acid and 2,4-dichlorophenoxyacetate. The preparation method comprises the following steps: reacting halogenated acetate with 2,4-dichlorophenate so as to obtain 2,4-dichlorophenoxyacetate; and directionally hydrolyzing 2,4-dichlorophenoxyacetate prepared in the previous step to obtain the composition of 2,4-dichlorophenoxyacetic acid and 2,4-dichlorophenoxyacetate. According to the invention, a process route is adjusted and creative improvement is made from the foundation; halogenated acetate reacts with2,4-dichlorophenate so as to prepare 2,4-dichlorophenoxyacetate, and directional hydrolysis is carried out so as to obtain the composition of 2,4-dichlorophenoxyacetic acid and 2,4-dichlorophenoxyacetate. The composition of 2,4-dichlorophenoxyacetic acid and 2,4-dichlorophenoxyacetate of the invention has excellent quality, high stability and good drug effect.

A catalyst carrying ionic liquid and metallic nanoparticles for preparing high-quality arylamine by hydrocatalyzing aromatic nitro compound is prepared through preparing immobilized ionic liquid by bonding the ionic liquid onto carrier, binding it with the active component containing transition metal or precursor, and reductive exchange. Its advantages are low reaction temp, long service life andno waste generation.

The invention relates to a method for preparing sodium alginate (SA) / hydroxypropyl methylcellulose (HPMC) / bentonite pH-sensitive type drug microspheres. The method includes: sodium alginate and hydroxypropyl methylcellulose are polymerized for modification and then combined with diclofenac to prepare the pH-sensitive type drug microspheres. The pH-sensitive type drug microspheres prepared by the method have the advantages that the pH-sensitive type drug microspheres are good in spheronization and have evident selectivity to drug release media, the accumulation release amount of the pH-sensitive type drug microspheres is less than 1% especially in an acid environment, and the pH-sensitive type drug microspheres can protect drugs for treating intestinal diseases from being absorbed by the stomach or destroyed by gastric enzyme, prolong curative effect and increase drug stability and has promising application prospect and advantages in fields of pharmaceutical engineering and bio-based materials.