Methyl Acetate Plant
Proprietary Technologyand Plants
Technology Introduction:
The methyl acetate production process SL TEC propose is based on the condensation of acetic acid and methanol over a solid acid catalyst. This kind of catalyst is the best solution when high yields, low acetic acid and methanol consumption, consistent product and low equipment corrosion are required on reliable basis. Under normal operation, this catalyst has an average service life of three years or longer.
The reaction conditions are moderate, however, as methyl acetate, methanol and water will form binary and tertiary azeotropic mixtures, it is very difficult to prepare high purity product by conventional methods.
In the traditional process, one reactor and nine distillation columns are required to produce high purity methyl acetate. And they have main disadvantages incl.
1. The synthesis of methyl acetate is reversible, and due to the limitation of chemical equilibrium, the conversion yield is low.
2. Methyl acetate-water binary azeotrope, methyl acetate-methanol binary azeotrope, and methyl acetate-methanol-water ternary azeotrope have boiling points quite close to that of azeotrope, thereby, it is difficult to separate and the product purification is very complicated.
We agent the ASU packing of Tianjin Univtech Co., Ltd., who was honored as the technical center of national chemical packing tower and internal fitting in 1990, and whose High Efficiency Packing Column with New Type Column Internals have been listed as the key marketing project among Chinas the Eighth Five-Year Plan and the Ninth Five-Year Plan technology achievements.
Product Type Conventional ASU Packing Its plain edge design has improved the gas-liquid flow at the interface of two adjacent packing tray to decrease local resistance, avoid early flooding and enlarge the equipment flexibility range.
High Throughout Packing Especially applicable in large scale ASU. Its special edge curve transition structure has good division effect to reduce the liquid accumulation among packing trays, increase the packing flooding point and the operation flexibility.
Copper Made ASU Packing Especially applicable in the oxygen-rich section of ASU and in precious gas packing.compared to aluminium alloy material, it shows higher mass transfer capability and safety performance.
Product Features -Two kinds of angle: 45 degrees (Y)
-Variable shape
-Low pressure drop saving energy consumption
-Strong plasticity and insignificant retracting effect
-Maximum diameter of up to 4800mm
Formaldehyde Plant
Technology Introduction of Formaldehyde Plant
SL TEC has close to ten years experience in formaldehyde production technology based on silver contact process(or silver catalyzed process). A lower methanol consumption, higher formalin product concentration, high export steam capacity and ease of operation are our features, which makes it the best technical and economically viable solution.
Every unit operation incl. methanol evaporation, catalytic reaction, absorption, off-gas treatment has optional design to at best satisfy the customers needs.
We provide one-stop package solutions from the formaldehyde plant design, manufacture, erection, commissioning, startup to training, with the production capacity of 6,000TPA 120,000TPA and the formaldehyde product concentration varying from 37-55%. And according to the customers different needs, there are totally 7 (seven) optional processes as follows:
1) Traditional Bubble Evaporator + Absorber with 3 (three) Concentration Gradients to produce 37% formalin
2) New Evaporator + Absorber with 3 (three) Concentration Gradients to produce 37% formalin
3) Off-gas Circulation + Re-boiler + Absorber with 3 (three) Concentration Gradients to produce 37-42% formalin
4) Off-gas Circulation + Re-boiler + Absorber with 3 (three) Concentration Gradients to produce 37-55% formalin
5) Off-gas Circulation + Evaporation Column + Absorber with 6 (six) Concentration Gradients to produce 37-55% formalin
There are 4 main prevailing processes for ethyl acetate production, i.e. Direct Esterification Process, Acetaldehyde Condensation Process, Ethanol Dehydration Process and Acetic Acid-Ethylene Addition Process. Each process has its advantages and its applicable services. Our process is based on reactive-distillation esterification, which is mature, low costing and suitable for those with acetic acid feedstock.
Technical Features:
Advantages of Our Ethyl Acetate Plant and Process Technology
In our reactive distillation process, organic acid catalyst is used; its advantages cover the followings:
â?¢ Low ethanol consumption
â?¢ Low catalyst dosage
â?¢ High catalysis activity
â?¢ Low equipment corrosion
â?¢ Less side reactions
â?¢ Higher product purity
â?¢ Simple post-treatment operations
Technology Introduction:
We offer complete package solutions for chemical distillation plant/distillation design/distillation tailoring using all-component analysis, process simulation, and a process automation package. Moreover, we also provide corresponding chemical sewage treatment solutions to satisfy the customers.
Chemical distillation plant/distillation design is our core competitiveness, we have engineering experiences in phenolic distillation plant, methanol-DMC distillation plant, coarse methanol distillation plant, fusil oil distillation plant, mixed aromatic distillation plant, light hydrocarbon distillation plant, acetate distillation plant (incl. methyl acetate, ethyl acetate, butyl-acetate and amyl-acetate) methylal distillation plant and dilute formalin enrichment plant.
Technical Features:
Our Capability in Distillation Design Software
â?¢ Partner
We have been cooperating with Tianjin University to establish a joint distillation engineering technology research center, which is mainly specialized in advanced distillation technologies, process control and troubleshooting.
Proprietary Technology and Plants
SL TEC has 15 years experience in acetic acid industry from technology R&D, plant design, engineering, and operation, has several reference plants and can ensure the safe, long term and stable running of the plant.
Our advantages lie in the following aspect:
1) The stability of catalyst is better compared to other process
2) The activity is better
3) The selectivity is higher
4) The process flow is short
5) Less equipment is required
6) The investment is lower
7) The enginery consumption is lower
There are two prevailing processes for sec-butyl acetate (SBA) production, i.e. iso-butanol-acetic acid esterification process and n-butene -- acetic acid addition process. Due to its much lower production cost, new SBA plants usually use the Addition Process, which is the very technology SL TECH provides. It consists of four units, feedstock purification unit, esterification unit, product separation unit and acetic acid recovery unit. Compared to the Esterification Process, the Addition Process for SBA production has advantages such as shorter process flow, less equipment and lower production cost (50-60% of Esterification Process); lower energy consumption (only 5% of Esterification Process); easy operation, lower maintenance cost and lower operation cost; harmless and poisonless solid acid catalyst, less pollution, less equipment corrosion.
Crude Aromatic Separation Technology
Proprietary Technology and Plants
Technology Introdction:
Our company offers naphtha cutting, reorganization of C9 crude aromatic hydrocarbon separation, reforming C10 crude aromatic hydrocarbon separation and other crude aromatic hydrocarbon separation technology. My company's crude aromatic hydrocarbon separation process with advanced process, the process of flexible operation, the process of low energy consumption, product yield advantages.In the case of 60,000 tons / year C10 crude aromatic hydrocarbon separation, the high boiling point solvent product has high aromatic content, strong dissolving power, low toxicity, small smell, high flash point, high boiling point, moderate evaporation rate, stable chemical and physical properties, Good leveling, and does not contain chlorine and heavy metals / physical characteristics, especially in the post-evaporation stage can play a high solubility, so that the smoothness of the coating and no orange peel, good gloss. In addition, it can also be used as a cleaning agent for precision machinery and the deployment of pesticide emulsifier. Is the production of high-grade paint, paint, thinner, ink, adhesives, oil additives and high temperature reaction of the ideal solvent, but also as anthraquinone production of hydrogen peroxide extractant. In addition, it can also be used as a cleaning agent for precision machinery and the deployment of pesticide emulsifier. Is the production of high-grade paint, paint, thinner, ink, adhesives, oil additives and high temperature reaction of the ideal solvent, but also as anthraquinone production of hydrogen peroxide extractant.
Iso-Butyl Acetate Plant
Proprietary Technology and Plants
Technology Introduction:
There are two prevailing processes for iso-butyl acetate (IBA) production, i.e. iso-butanol-acetic acid esterification process and n_butene_acetic acid addition process. Due to its much lower production cost, new IBA plants usually use the Addition Process, which is the very technology SL TECH provides. It consists of four units, feedstock purification unit, esterification unit, product separation unit and acetic acid recovery unit. Compared to the Esterification Process, the Addition Process for IBA production has advantages such as shorter process flow, less equipment and lower production cost (50-60% of Esterification Process); lower energy consumption (only 5% of Esterification Process); easy operation, lower maintenance cost and lower operation cost; harmless and poisonless solid acid catalyst, less pollution, less equipment corrosion.
Technical Features:
1. Fixed Bed tubular Reactor To ensure the separation effect in the reactor, a disc distributor is arranged at the feedstock inlet; to strengthen the heat exchange effect and better control the temperature in the catalyst bed, baffles are designed in the reactor shell side; to reduce the energy consumption, two pre-heating stages are designed, the first stage is the plate heat exchanger while the second stage is the tubular heat exchanger.
2. Modified Cation Exchange Resin Catalyst The catalyst is high temperature resistant strong acid resin modified by metal chloride to prolongitself service life. Also after the modification, the conversion yield as weel as the selectivity will be increased at some extent.
