Modified starch using cyanuric chloride as linking radical and preparation method thereof

By means of utilizing cyanuric chloride in the shown structure as jointing radical, modified starch, including anionic modified starch, cationic modified starch and amphoteric modified starch, with different functional groups may be prepared. The production process of modified starch has less cross-linking and raised utilizing rate of modifier.

Method of synthesizing 4,4'-dimethyltrianiline

Method of synthesizing 4,4'-dimethyltrianiline

The invention is a synthesis method for the 4,4 '- dimethyl triphenylamine; the 4,4'-dimethyl diphenylamine and bromophenyl are used as the raw materials; The potassium tert-butanol is used as the acid tying reagent; in the dimethyl sulfoxide solvent, the 4, 4 '- dimethyl triphenylamine is synthesized through the microwave radiation. The invention uses the microwave radiation to replace the ordinary heating and successfully synthesizes the 4, 4 '- dimethyl triphenylamine; the collection rate can reach 69.5 percent. For the synthesis method of the invention, the reaction time is short; the collection rate of the products is high; the production cost is low.

Method for using microwave drying detonator

The invention relates to a method which adopts microwaves to dry detonators. The method is that an undried finished detonator with 5 to 20 percent of water content is equally laid onto a drying plate, and the material thickness is 15 to 30mm, then the detonator is put into a microwave to carry out microwave drying in a condition with the vacuum degree of 0.080 to 0.085 MPa and the microwave power of 500 to 5000W. The drying method of the invention is suitable for drying RDX, HMX, PETN, NQ, TNT, etc. various single compound explosives. The complete drying time of the detonator is between 1000 and 2000s, which is far less than a normal static plate drying method by 7 to 8 hours, and the water content of the detonators is less than 0.01 percent after drying.

Technique for preparing m-cresol

A preparation technical of m-cresol is that: M-cresol is diazotizated, and hydrolyzed while at the same time steam is distilled to prepare a distilled m-cresol hydrolysis liquid. The distilled hydrolysis liquid passes through a N3520 type macroporous resin, and is eluded by organic solvent; the m-cresol product is obtained after rectifying. The invention adopts steam to distil m-cresol generated by hydrolyzation in time, which produces little byproduct tarry matter and increases the yield rate of m-cresol; preparation of product and treatment of waste water are carried out at the same time, which reduces the waste water treatment procedure and simplify the progress of preparation technology; because the invention adopts N3520 type macroporous resin to dispose the distilled m-cresol hydrolysis liquid, the m-cresol is easily desorbed with a fast desorption rate and a short reaction cycle, thus being beneficial to the recycle of m-cresol. The preparation technology of m-cresol of the invention ...

Method for using microwave drying detonator

Pectin producing method

Preparation method of TAT

The invention relates to a preparation method of TAT, comprising the following steps of: slowly dripping acetic anhydride with 1.5-2.5 times of the mass of HA at 5-10 DEG C by using the HA, ammonium acetate and water as raw materials; reacting for 30-50 minutes to obtain DAPA under stirring; reacting for 2-3 hours by using DAPT and the acetic anhydride as the raw materials and increasing temperature to 100-110 DEG C; and reacting for 1-2 hours by reducing the temperature to 30-35 DEG C to obtain a product TAT, in the presence of water as a catalyst, wherein the water accounts for 5-35 percent of the mass of the acetic anhydride raw material. The invention replaces the catalyst in a Lukasavage process method with the inexpensive water, obviously enhances the yield of the TAT, enables the synthesizing process of the TAT to be easy and reduces the production cost.

High density rock powdery emulsion explosive and preparation method thereof

The invention belongs to the technical field of explosives and particularly relates to a high density rock powdery emulsion explosive and a preparation method thereof. The invention aims to provide a high density rock powdery emulsion explosive of which the density can be increased and detonation performance can be improved. The high density rock powdery emulsion explosive contains ammonium nitrate, urea, paraffin, composite oil, an emulsifier and a regulator. The preparation method comprises the following specific steps: 1) using ammonium nitrate and urea to prepare an aqueous phase solution; 2) using paraffin, composite oil and an emulsifier to prepare an oil phase solution; 3) adding the aqueous phase solution and oil phase solution in a mixing emulsifier to emulsify and obtain a sticky paste; 4) conveying the sticky paste with a screw pump to a spray gun arranged in a drying and powder production tower, atomizing and dewatering the paste, drying to prepare a powdery emulsion explosive ...

Preparation method for hexogon

Gemini surfactant containing triazine ring

Disclosed is a Gemini surface active agent as indicated in a general formula (I), the surface active agent has a molecular structure taking a triazine ring as a linking group and possesses rather high stability, and the critical surface tension thereof is far weaker than that of the common surface active agent, the critical micelle concentration is lower than that of the common surface active agent by 2 to 3 orders of magnitude, and the surface activity is excellent.

Preparation method of 4,5-dimetridazloe ammonium salt

The invention relates to a preparation method of a 4,5-dimetridazloe ammonium salt. The method comprises the following steps of: mixing imidazole and concentrated sulfuric acid at room temperature according to a mass ratio of 1:(3-3.2) and reacting for 10-30min; rising temperature to 50-55 DEG C, and slowly dropping nitric-sulfuric mixed acid to react for 1-2h to obtain 4-nitroimidazole; adding concentrated nitric acid to the 4-nitroimidazole and carrying out a reflux reaction for 30-45min at 80-85 DEG C; continuing to adding the concentrated sulfuric acid, rising the temperature to 110-115 DEG C and reacting for 2-2.5h to obtain 4,5-dimetridazloe crystals; and dissolving the crystals in acetone and leading ammonia gas to obtain a 4,5-dimetridazloe ammonium salt hydrate. The preparation method of the 4,5-dimetridazloe ammonium salt further improves the yield of 4,5-dimetridazloe and eliminates the acidity of the 4,5-dimetridazloe, and the prepared 4,5-dimetridazloe ammonium salt can be ...

Method for producing hexogen

The invention discloses a method for producing hexogen. In the method, urotropine and concentrated nitric acid are taken as reaction materials, and the weight ratio of the urotropine to the concentrated nitric acid is 1:9-11. On the basis of a conventional direct-nitrolysis production process, the method comprises the following steps of: simultaneously and uniformly feeding the raw material urotropine with the fineness of 60 to 80 meshes into a device containing the concentrated nitric acid from at least two feed inlets, and reacting the urotropine with the concentrated nitric acid under the condition of 10 to 15 DEG C to prepare the hexogen. The method remarkably increases the yield of the hexogen from original 78.4 percent to over 85.2 percent only by changing the feeding way and fineness of the reaction material without increasing any investment.

Preparation method of 3,4-binitropyrazole

The invention relates to a preparation method of 3,4-binitropyrazole, comprising the following steps of: adding pyrazole to glacial acetic acid; sequentially adding fuming nitric acid and acetic anhydride for reaction to obtain N-nitropyrazole; dissolving the N-nitropyrazole into anisole, and carrying out temperature-rise reaction to obtain 3-nitropyrazole; dissolving the 3-nitropyrazole into concentrated sulfuric acid, adding mixed acid according to the weight-to-volume ratio of the 3-nitropyrazole: the mixed acids=1: (5-8), and carrying out nitration reaction to obtain the 3,4-binitropyrazole, wherein the mixed acid is prepared from the concentrated sulfuric acid and concentrated nitric acid according to the volume ratio of 1: (0.3-1.2). The preparation method of the 3,4-binitropyrazole, which is disclosed by the invention, has the advantages of extensive raw material source and moderate process condition; in addition, the 3,4-binitropyrazole has total yield of 16-18 percent and purity ...

pectin producing method

The present invention relates to chemical extraction and refining technology. Orange peel, sunflower receptacle and beet pulp as material are first dealuminized with oxalic acid, citric acid or theirmixture, and the aluminum pectinate as intermediate is treated with 80-95% concentration alcohol at room temperature for 2-4 hr. During aluminium salt settling separation, mixed aluminium pectinate solution is mixed with sodium sulfite or sodium bisulfite as decoloring agent at 60-90 deg.c through stirring for 20-60 min. The present invention is easy to use in industry.

Salt-containing waste water treatment method for meta-cresol production

This invention relates to a method for treating salt-containing waste-water from the production of M-cresol. The waste-water, after pre-treatment of absorption by powder activated carbon, is proceeded the electroosmosis treatment. The effluent is used as sulphuric acid solution for cyclic utilization, the residual salt-containing waste-water is neutralized for production of mirabilite. In this invention, the recovered sulphuric acid solution, after the treatment, contains Naf ion with its concentration being lower than 2g/L, the sulphuric acid solution recovery rate is upto 80%, and being able to be utilized in hydrolytic reaction for M-cresol production. This method is useful for environmental protection.

Trimerization anion surface active agent

The invention relates to a trimerization anion surface active agent which has the structure disclosed by the following general formula (I). The trimerization anion surface active agent comprises raw materials of cyanuric chloride, aliphatic amine, tarine and 3 (2- aminoethyl) amine and is synthesized by three reaction steps. Compared with neopelex, the trimerization anion surface active agent greatly reduces the critical micelle concentration, has excellent surface activity and wide application prospect in industrial and agricultural production and daily life of people, wherein R represents CnH(2n+1) (n represents even numbers from 6 to 14).

Gemini surfactant containing triazine ring

Disclosed is a Gemini surface active agent as indicated in a general formula (I), the surface active agent has a molecular structure taking a triazine ring as a linking group and possesses rather highstability, and the critical surface tension thereof is far weaker than that of the common surface active agent, the critical micelle concentration is lower than that of the common surface active agent by 2 to 3 orders of magnitude, and the surface activity is excellent.