Chemical Engineering
Dye Intermediate Special Flash Dryer
Application Client：Jiangsu Yabang Dye Co., Ltd., Clariant Dye Chemical Co., Ltd. ……
Project Classification：Chemical engineering industry
Dryer Type：XZG Series Spin Flash Dryer
Project Description：Dye intermediates, also known as intermediate, refers to a variety of aromatic derivatives for the production of dyes and organic pigments. They are with aromatic hydrocarbons, benzene, toluene, naphthalene and anthracene from coal chemical and petrochemical as the basic raw material, and are made through a series of organic synthesis unit process.
The Product Overview of The Dye Intermediate:
Dye intermediates, also known as intermediate, refers to a variety of aromatic derivatives for the production of dyes and organic pigments. They are with aromatic hydrocarbons, benzene, toluene, naphthalene and anthracites from coal chemical and petrochemical as the basic raw material, and are made through a series of organic synthesis unit process. With the development of chemical industry, the application scope of dye intermediates has expanded to pharmaceutical industry, pesticide industry, explosives industry, information recording materials industry, as well as additives, surfactants, perfumes, plastics, synthetic fibers and other productive sectors. There are many varieties of dye intermediates, and there are hundreds of more important varieties. The most important early dye intermediates, such as nitrobenzene, aniline, phenol, chlorobenzene and phthalic anhydride, etc., because of wide application and large consumption, has developed into an important basic organic intermediates. The world's annual output is more than 1 million tons. Now the most important dye intermediates include o-nitrochlorobenzene, p-nitrochlorobenzene, o-nitrotoluene, p-nitrotoluene, 2-naphthol, anthraquinone, 1-amino-anthraquinone, etc.. Starting from the above intermediates, and then through a series of organic synthesis unit process, all kinds of complicated structure intermediate can be obtained.
Dye intermediates mainly include four categories: benzene intermediates, toluene intermediates, naphthalene intermediates and anthraquinone intermediates. In addition, there are some heterocyclic intermediates. In the production process of intermediates, the commonly used chemical reaction mainly consists of nitration, sulfonation, halogenation, reduction, amination, hydrolysis, oxidation, condensation, etc.. The synthesis of a complex structure intermediate, usually need to go through many units of process, and sometimes can also adopt the different basic raw materials and different synthetic routes. For the nitroaniline production, for example, we first get aniline with benzene nitration and reduction, and then through acetylation, nitration, hydrolysis. This synthetic route has a long production process and high cost. The modified synthetic route is that we first get p-nitrochlorobenzene through the benzene chlorination, nitration and separation, and then through the high-pressure ammonolysis. The special intermediates that used in the manufacture of dyes, pesticides or pharmaceuticals, usually have complex structures, often form a complete set of production with final products. Because of the smaller output, we usually use intermittent operation to produce. Some widely used intermediates, such as nitrobenzene, aniline, chlorobenzene, phenol, etc., are usually produced in a comprehensive and large-scale chemical plant. Because of the bigger output, we usually use continuous operation to produce.
Product Overview of Dye Intermediates Flash Dryer
Dye intermediates rapid drying equipment adopt XSG series spin flash dryer that developed by our company. With the reference to foreign advanced technology, our company self-designed Spin Flash Dryer. After several years of experience accumulation, structure improvement and design optimization, our company has developed a real dye intermediates special flash dryer. The characteristics of the equipment include the large drying volume, high drying intensity; can effectively prevent material deposition and sticking wall, strong adaptability for heat-sensitive materials, etc. Application range is broaden from chemical to food, pharmaceutical, mining, agricultural and sideline products processing, and other fields. The φ1200 type flash dryer has achieved a complete success in Zhejiang Shanyu dye Co., Ltd..
Dyes, pigments, pharmaceutical intermediates and other organic materials, most of them have the characteristics of combustible, explosive, thermal metamorphism, etc.. If the wall sticking or material deposition occurs in the drying process, these materials will be oxidative deterioration and even spontaneous combustion. In mild cases, carbon black particles generated in spontaneous combustion will entrainment in materials to influence products quality. In severe cases, these materials will have the possibility of intense burning and explosion. In the long run process, hot blast stove will inevitably appear weld cracking and leakage phenomenon. In this case, the flue gas with a spark will string into the flash dryer, which may lead to material pollution, material burning, bag burning and systems explosion. For this kind of situation, our company has done a lot of technical development works. For the first time to solve the materials oxidation, decomposition and metamorphose technical problems resulting from the materials deposition and sticking wall, when the flash dryer to handle high thermal sensitive and high viscosity materials. Meanwhile, our company became the first one in the country to achieve a "even if there is leakage in hot blast stove, gas is not fleeing into the dry gas stream", and effectively improve the production safety in the organic material drying process.
The improved thermal sensitive material special drying system has been successfully used in D-acid, J-acid, scarlet acid, H-acid, Brighteners VBL, Phthalocyanine Blue Series Pigments, Rubber Scarlet, Purple Rubber, Lithol Rubine, Benzidine Yellow, naphthalene series dyes and intermediates, cyanuric acid, sodium dichloroisocyanurate, trichloroisocyanuric acid sodium, triclosan, organic flame retardant and other industries, the effect is remarkable. Flash dryer is a relatively large energy consumption equipment. Due to the increasingly nervous energy and rising price, the saving energy and reducing consumption are becoming more and more important. Our company creatively combine fuzzy theory with neural network integration theory to use for the design of spin flash dryer, so that the production of conventional flash dryer can be increased by 50%, the energy consumption decreased by 30%.Especially the optimized combination of flash dryer and coal-fired hot blast stove , has made the energy efficiency ratio of flash dryer up to a whole new level.
Working Principle
The hot air enters into the bottom of the drier through a specially designed dispenser. Cream and cake shape materials are fed into the dryer by the screw feeder. Due to the combined effect of the high-speed rotating stirrer and hot air, these materials was rapidly dispersed to be fluidized and dried in the falling process, and eventually become granular or powder. With the rotating rising process of hot air, larger particles and high moisture materials subjected to the centrifugal force are threw to the wall. Through the interception of classifier, the materials fall back into the bottom, and was again dispersed, dried. The materials with suitable particle size and qualified moisture are discharged by the classifier, collected by cyclone separator and bag collector for finished products.
Features
- the machine to complete the dynamic integration of swirling flow, fluidization, spouting， crushing and winnowing classification technology. Cream and cake shape materials can be once dried as qualified powder products;
- Design with compact structure and required small occupied area, the machine is with continuous operation and high production efficiency.
- Large drying intensity, low energy consumption, thermal efficiency can reach above 70%;
- Short residence time, good product quality, the dryer can be used for drying heat sensitive materials.
- Negative pressure operation, good leakproofness, little environmental pollution.
Some Typical User
- Jiangsu Yabang Dye Co., Ltd.
- Clariant Dye Chemical Co., Ltd.
- Zhejiang Shanyu Dye Co., Ltd.
- Zibo Huawei Pigment Co., Ltd.
- Chizhou Taiyang Pigment Co., Ltd.
- Longkou City Renhe Ultramarine Chemical Co., Ltd.
