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Dye intermediate spray dryer
Dye intermediates, also known as intermediates, refer to various aromatic derivatives used in the production of dyes and organic pigments. They are pr
Product details
Project Description:
Dye intermediates, also known as intermediates, refer to various aromatic derivatives used in the production of dyes and organic pigments. They are produced from aromatic hydrocarbons such as benzene, toluene, naphthalene, and anthracene derived from coal and petrochemical industries through a series of organic synthesis unit processes (see reaction process).
Types of dye intermediates:
Dye intermediates mainly include benzene intermediates, toluene intermediates, naphthalene intermediates, anthraquinone intermediates, and some heterocyclic intermediates.
Synthesis method:
The commonly used reaction processes for producing intermediates include nitration, sulfonation, halogenation, reduction, amination, hydrolysis, oxidation, condensation, etc. The synthesis of a complex intermediate structure often involves multiple unit processes, and sometimes different basic raw materials and synthetic routes can be used. For example, in the production of nitroaniline, the synthesis route involves initial nitration and reduction with benzene to obtain aniline, followed by acetylation, nitration, and hydrolysis. This method has a long production process and high cost. We have now switched to the synthetic route of benzene chlorination, nitration, and separation to obtain p-nitrochlorobenzene, followed by high-pressure ammonolysis. Specialized intermediates used in the manufacture of dyes, pesticides, or pharmaceuticals, typically with complex structures, are often produced in conjunction with final products, resulting in small yields and often using intermittent operations in production. Some intermediates with wide applications, such as nitrobenzene, aniline, chlorobenzene, phenol, etc., are usually produced in comprehensive large-scale chemical plants with large output and continuous operation.
Application of dye intermediates:
With the development of the chemical industry, the application scope of dye intermediates has expanded to the pharmaceutical industry, pesticide industry, explosives industry, information recording material industry, as well as production sectors such as additives, surfactants, fragrances, plastics, synthetic fibers, etc.
Overview of dye intermediate dryer:
Spray drying is a widely used process in liquid forming and drying industries. ***It is suitable for generating powder and granular solid products from solution, lotion, suspension and paste liquid raw materials. Therefore, spray drying is a very ideal process when the particle size distribution, residual moisture content, bulk density and particle shape of the finished product must meet accurate standards.
Principle of dye intermediate dryer:
After filtering and heating, the air enters the top air distributor of the dryer, and the hot air enters the drying chamber uniformly in a spiral shape. The feed liquid passes through the high-speed centrifugal atomizer at the top of the tower body, and (rotating) spray into extremely fine droplets, which flow in parallel with hot air and can be dried into finished products in a very short time. The finished product is continuously output from the bottom of the drying tower and the cyclone separator, and the exhaust gas is discharged by the fan.
Characteristics of dye intermediate dryer:
A. The drying speed is fast, and after atomization, the surface area of the material liquid is greatly increased. In the hot air flow, 95% -98% of the water can be evaporated instantly, and the drying time is only a few seconds. It is particularly suitable for drying heat sensitive materials.
B. The product has good uniformity, fluidity, solubility, high purity, and good quality.
C. The production process is simplified and the operation control is convenient. For liquids with a moisture content of 40-60% (up to 90% for special materials), they can be dried into powder products in one go without the need for crushing and screening, reducing production processes and improving product purity. The particle size, bulk density, and moisture content of the product can be adjusted within a certain range by changing the operating conditions, making control and management very convenient.
Application of dye intermediate dryer:
| Chemical industry: sodium fluoride (potassium), alkaline dyes and pigments, dye intermediates, compound fertilizers, formaldehyde silicate, catalysts, sulfuric acid agents, amino acids, white carbon black, etc. Plastic resin: AB, ABS lotion, urea formaldehyde resin, phenolic resin, sealant (urea) formaldehyde resin, polyethylene, PVC, etc. Food industry: high-fat milk powder, pectin, cocoa milk powder, milk replacer powder, egg white (yellow). Food and plant juice: oatmeal, chicken juice, coffee, instant tea, spices, meat, protein, soybean, peanut protein, hydrolysate, etc. Carbohydrates: corn syrup, corn starch, glucose, pectin, maltose, potassium sorbate, etc. Ceramics: alumina, ceramic tile materials, magnesium oxide, talc, etc. |
Technical parameters of dye intermediate dryer:
Project \ \ Parameters \ \ Model |
5 |
25 |
50 |
150 |
200-2000 |
Inlet temperature |
140-350 self-control |
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Outlet temperature |
80-90 |
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Water evaporation rate |
5 |
25 |
50 |
150 |
200-2000 |
Drive type of centrifugal spray head |
Compressed air transmission |
Mechanical tradition |
|||
rotational speed |
25000 |
18000 |
18000 |
15000 |
8000-15000 |
Spray disc diameter |
50 |
120 |
120 |
150 |
180-240 |
heat source |
electricity |
Steam+Electricity |
Steam+electricity, fuel oil, gas, hot air stove |
||
Electric-heating power |
9 |
36 |
72 |
99 |
|
Dimensions (length x width x height) |
1×0.93×2.2 |
3×2.7×4.26 |
3.5×3.5×4.8 |
5.5×4×7 |
Determine according to the actual situation |
Dry powder recycling |
≥95 |
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Note: The evaporation rate of water is related to the characteristics of the material and the temperature of the hot air inlet and outlet. When the export temperature is 90 ℃, the water evaporation curve is shown in the above figure (for selection reference). As the product is constantly updated, relevant parameters may change without prior notice.
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