Principle of catalytic cracking of waste rubber tires in the process

Waste rubber tire catalytic cracking technology to deal with "black pollution"

This is an effective way to reduce environmental pollution and turn waste into treasure. Since the 1970s, some industrially developed countries have begun to study the use of used tires. For example, Japan and the United States use waste rubber tires as fuel for power generation or cement production. However, since the 1990s, many countries, such as Britain and the United States, have become interested in the cracking technology of waste rubber tires. These countries use about 1000 high temperature cracking. The disadvantages are high energy consumption, poor quality of cracked carbon black and low yield. This work is to crush the waste rubber tires, and then under the action of the catalyst, only need to be heated to about 400, which will be cracked into cracked gas, cracked distillate oil, and simultaneously react to form carbon black. The cracked distillate is fractionated to obtain gasoline, diesel and heavy oil. After researching and exploring the process plan and operating conditions, it has successfully achieved industrialization, and has achieved remarkable economic benefits after two years of operation. The process has the advantages of low energy consumption, good product quality, no pollutant emission, simple process, easy operation and control, and is a relatively advanced waste rubber tire treatment technology in the world.

Technical analysis: Principle of catalytic cracking of waste rubber tires in the process

First, the steel ring of the waste tire is peeled off, and then diced, first coarsely crushed, then finely crushed, and then quantitatively fed into the reactor through a continuous feeder of the catalyst A-channel, and subjected to catalytic cracking reaction under a certain temperature and pressure. The raw material is passed through the reactor, and the residence time in the reactor is about 10 min. Then, the reaction product is sent to a gas-solid separator for separation, and the solid material is sent to the grinding section through a continuous discharge machine, and the air is selected into a finished carbon black after grinding. The oil and gas obtained from the gas-solid separator enters the condenser and the fractionation tower, and separates the cracked gas, the gasoline fraction, the diesel fraction and the heavy fraction.

The process conditions of the gasoline fraction and the diesel fraction after desulfurization and dehydration and the catalytic cracking reaction of the reaction result are the key steps in the whole production process. The reactor is the main equipment, and the reactor material requires a relatively high degree of corrosion resistance and temperature resistance. The pilot plant uses a volumetric gas-solids separator, which makes it easier to separate the two phases due to the large difference in gravity between the oil and gas. In order to reduce the amount of solid particles entrained in the gas stream, the volume of the device is large enough to reduce the gas velocity. The oil and gas are sent to the condenser for condensation and then enter the oil and gas separation tank to obtain cracked gas and distillate oil.

Cracking gas composition analysis result component hydrogen air methane ethane ethylene propane propylene isobutane n-butane volume percentage /% component volume percentage /% 1 butyl 2 - antibutene 2 - cis-isopentane n-pentane Total Pentane Hydrogen Sulfide Carbon Dioxide Carbon monoxide has a small amount of water entrained during distillation. Therefore, a dehydration process is designed in the process, and the organic sulfur and inorganic sulfur are removed together to the specified standard by desulfurization.

Oil Distillation Range and Yield Oil Name Distillation Range/Yield/% (% by Mass) Petrochemical Diesel Heavy Oil Total Physical and Chemical Analysis Results of Project Carbon Project Data Absorption/gkgi 35 mesh sieve residue/% CTAB adsorption surface area/ M2g-1 impurity /% 300% modulus / MPa elongation /% heating loss /% tensile strength / MPa ash /% fine powder content /%, carbon black burning residue (ash), binding properties of raw materials, the residue is presumed as follows: sulphides and sulphates difficult to decompose; inorganic salt added rubber processing and metal oxide; human waste tire with mechanical impurities. Through the process analysis, the yield of carbon black is about 35%, that is, carbon black is inherent in the raw materials, and no rubber is formed in the rubber during the production process, thereby ensuring the quality of the carbon black.

Steady-state simulation and dynamic simulation comparison Steady-state simulation Dynamic simulation only algebraic equations Simultaneous differential equations and algebraic equations Material balance Algebraic equations are used to describe material balance Differential equations are described. Energy balance is described by algebraic equations. Energy balance is described by differential equations. Thermodynamic methods Anhydrodynamic constraints have hydraulic limitations without controllers with controllers for steady-state simulations, although in theory there are multiple methods of flow calculation, almost all commercial steady-state simulation software uses sequential Sequential method for process calculation. The sequential method requires that the model and algorithm of each unit process are combined to form a so-called module. The calculation process is performed one by one by module. Only one module can be solved at a time. The module in the back must be solved after the previous module is solved. If there is a return item in the process, it will take several iterations to get a convergent solution.

PET Blowing Mold

PET Blow Molding,PET Bottle Mould,Bottle Blowing Mold,PET Blowing Mold

Demark(changxing)injection system CO. LTD , https://www.petplas.com