A Brief, dye intermediates products
Dye intermediates, also known as intermediates, referring to used in the production of dyes and organic Pigment of various aromatic derivatives. They are from the coal chemical industry and petrochemical industry, such as benzene, toluene, naphthalene and anthracene aromatics as basic raw materials, through a series of organic synthesis unit process (see reaction process) was prepared. With the development of chemical industry, dye intermediates has been extended to the application scope of the pharmaceutical industry, pesticide industry, fire explosive industry, information recording materials, and additives, surfactants, spices, such as plastic, synthetic fiber production. A lot of varieties of dye intermediates, there are hundreds of more important. Early is the most important dye intermediates, such as nitrobenzene, aniline, phenol, chlorobenzene and phthalic anhydride, etc., because of the wide usage, dosage, has developed into important basic organic intermediates, the annual production of one million tons or more. Now the most important dye intermediates are neighbouring nitryl chlorobenzene, of nitrochlorobenzene, adjacent nitrotoluene, of nitrotoluene, 2 - naphthol, anthraquinone, 1 - amino anthraquinone, etc. Starting from the intermediates, again after a series of organic synthesis unit process, and various structure can be obtained from the complex mixed intermediate.
Dye intermediates mainly include benzene intermediates, toluene intermediates, naphthalene intermediates and anthraquinone intermediates four categories, in addition, there are also some heterocyclic intermediates. Production of intermediates commonly used mainly include nitration reaction process, sulfonated, halide, reduction, amination, hydrolysis, oxidation, condensation, etc. Intermediate of synthesis of a structure is relatively complex, often passes through many cell processes, and sometimes can adopt different basic raw materials and different synthetic routes. The nitro aniline production, for example, at first by nitration, reduction of benzene to aniline, acetylation, nitration, hydrolysis of synthetic route again, this method, long production process, high cost. Now switch to benzyl chloride, nitrate, separation of nitrochlorobenzene, synthetic route of high pressure ammonia solution again. Used in the manufacture of dyes, pesticides or dedicated pharmaceutical intermediate, usually complicated structure, and often the end product of form a complete set production, small production, production with intermittent operation. A wide range of intermediates, such as nitrobenzene, aniline, chlorobenzene, phenol, etc., usually in comprehensive large type chemical plant production, production, production by continuous operation.
Second, special dye intermediates product Brief flash drier
Dye intermediates quick Drying equipment is developed by our company XSG series fast Spin Spin flash dryer. With reference to foreign advanced technology, self-designed rotating rapid flash drier; After several years of experience accumulation, structure design and improvement of the optimized, with a large volume of drying, drying intensity is high, can effectively prevent wall material deposition and sticky and strong adaptability for heat-sensitive materials etc. Application range from chemical broaden to food, pharmaceutical, mining, agricultural and sideline products processing, and other fields, the development of the real special flash drier dye intermediates.
Dyestuff, Pigment, pharmaceutical intermediates and other organic materials, most of the combustible, explosive, thermal metamorphism characteristics. In the process of drying, material if deposit or stick wall, will the oxidation spontaneous, even mild combustion will produce carbon black particle entrainment in the material influence the quality of our products and the possibility of severe cases will have intense combustion and explosion.
In the process of Hot blast stove in the long run, will inevitably be also welding crack and the phenomenon of air leakage, the smoke entrainment Mars string into the flash drier, may lead to material pollution, material burning and explosion combustion, cloth bag. For this kind of situation, a lot of technology development work on the factory, for the first time completely solve the flash drier Handled high temperature sensitive, high viscosity material, material for deposition and wall sticking oxidation, decomposition, deterioration of technical problems, and in the domestic first do to "even if the Hot blast stove air leakage, smoke also won't into dry in the air", effectively improve the safety of the organic material in the drying process.
After improvement, the special thermal sensitive material drying system has been successfully applied to the D acid, J acid, scarlet acid, H acid, whitening agent VBL, phthalein cyanine series red Pigment, rubber, rubber amaranthine, lithol rubine, benzidine yellow, nai dyes and intermediates, cyanuric acid, sodium dichloro different cyanuric acid, cross-linked with different cyanuric acid sodium, new chemical, organic flame retardants, and other industries, the effect is remarkable.
Flash drier is a larger equipment, energy consumption in an increasingly tense energy, the price is rising today, saving energy and reducing consumption times as important as well.
Three, the working principle of dye intermediates for flash drier
Hot air passes through a specially designed distributor enters into the bottom of drier, cake shape material, paste by a screw feeder into dryer, whereabouts rotating at high speed mixer and in the process of hot air, under the function of quick dispersion for fluidization drying, become granular or powder, in the process of decreasing with a stream of rotating, larger particles, high moisture materials subjected to centrifugal force is flung to the wall, the classifier intercept fall back into the bottom, was again dispersed, dry; Particle size suitable materials, water qualified through the classifier, collected by cyclone separator and bag collector for finished products.
Four, dye intermediates special flash drier equipment characteristics
1, the machine to complete the hydrocyclone, fluidization, spray, organic combination of crushing and grading air separation technology, cream and cake shape material can be a dry for qualified powder products; Equipment is compact, Floor area is small, continuous operation, high production efficiency;
2 and large intensity of drying, low energy consumption, heat efficiency can reach above 70%;
3 short residence time, material, finished products of good quality and can be used for drying thermal sensitive material;
4, a negative pressure operation, good sealing, little environmental pollution.