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[0005] The purpose of the present invention is to provide an environment-friendly, energy-saving, high-efficiency PVC production system and method, especially for the production of PVC based on mineral-rich limestone that does not rely on petroleum resources, and solves the problems of mercury pollution and high energy consumption in the existing calcium carbide method Problems, to achieve green production of environmental protection and energy saving
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Embodiment 1
[0035] Embodiment 1: basic loop method PVC production technology
[0036] The polyvinyl chloride basic loop method technological process of the present embodiment is as Figure 4 As shown, the production process and equipment implementation plan are as follows:
[0037] 1) Initial: The oxygen-enriched calcium carbide furnace adopts a shaft furnace, and a raw material pretreatment and mixing device is used to prepare limestone powder and coal powder, and a uniform mixture of limestone powder and coal powder with strict ratio requirements is delivered to the furnace. Stable reaction with oxygen under the optimized process conditions, the upper part exports the synthesis gas CO, and the lower part exports calcium carbide, such as Figure 4 As shown, enter the next process from the left and right sides respectively.
[0038] 2) Left path: export calcium carbide from the shaft furnace reactants, use waste heat to utilize high-efficiency acetylene generator, make calcium carbide r...
Embodiment 2
[0042] Embodiment 2: extended loop method PVC production technology
[0043] The polyvinyl chloride extended circular route of this embodiment is to use the diversity of resource structures in different countries and regions. An open window is set in the middle link of the basic circular route to accept the addition of external intermediate raw materials, such as Figure 5 Shown is a specific feasible solution:
[0044] in the above Figure 4 In the basic circular process flow shown, when the acetylene in the left path can be supplemented by natural gas resources, the right path can be supplemented by bioethanol from natural resources.
[0045] In addition, as in image 3 In the green PVC production process shown in the loop method, if any part of the closed loop is turned into an open-loop process, it can become a feasible production process. figure 1 with figure 2 The two current processes shown can be regarded as open-loop process routes formed by removing some units i...
Embodiment 3
[0046] Embodiment 3: basic loop method production system
[0047] The polyvinyl chloride basic loop method production system of the polyvinyl chloride loop route production system of the present invention is as Image 6 As shown, the implementation scheme is as follows:
[0048] 1) Start: The oxygen-enriched calcium carbide furnace 13 is a shaft furnace, and the solid material crushing and compounding equipment 11 and the solid material conveying equipment 12 are used to deliver the limestone powder and carbon powder with strict ratio requirements to the oxygen-enriched calcium carbide furnace 13 Homogeneous mixture, the oxygen-enriched calcium carbide furnace 13 is provided with a solid material inlet 15 and an oxygen gas inlet 17, and oxygen is input into the oxygen-enriched calcium carbide furnace 13 by the oxygen-enriched gas blowing device 14 through the gas inlet 17, and the solid material is processed under the optimal process conditions set. Underneath and with the pa...
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Abstract
The invention provides a polyvinyl chloride loop route production system and a method, and belongs to the field of new coal chemical industry materials and the technical field of polymer material science and engineering, wherein oxygen-rich calcium carbide reacts in a high temperature reaction furnace to obtain calcium carbide and synthesis gas, the subsequent process is divided into two branches, one branch process is preparing acetylene from the calcium carbide, the other branch process is preparing ethanol from the synthesis gas, and then preparing dichloroethane through ethanol step, a closed loop is formed after the two branch reactions are completed and combined, both end products can be subjected to a reaction to prepare a vinyl chloride monomer, and the existing technology can be adopted to prepare the PVC from the vinyl chloride monomer. The system mainly comprises a solid raw material crushing and compounding device, a solid material conveying device, an oxygen-rich calcium carbide furnace, an oxygen-rich gas blowing device, a shell and tube constant temperature reactor, a fixed bed tubular reactor, a fluidized bed reactor, an acetylene generator with a heat exchanger, a fixed bed reactor, and a polymerization kettle reactor. The system and the method have the following advantages that: dependence of polyvinyl chloride production on petroleum resources is relieved, and mercury pollution is completely eliminated.
Description
technical field [0001] The invention relates to an environment-friendly, energy-saving and high-efficiency polyvinyl chloride circular synthesis route green production system and method, belonging to the field of new coal chemical materials and the field of polymer material science and engineering technology. Background technique [0002] Polyvinyl chloride (hereinafter referred to as PVC) is the most widely used variety among the five general-purpose resins. It is widely used in many fields such as construction, automobiles, high-speed rail, ships, aerospace, and national defense. It plays a very important role in national economic and social development. . Taking building materials as an example, compared with traditional materials, PVC is more energy-efficient in production and use. Therefore, PVC doors and windows have long been popularized in developed countries in Europe and the United States, and China has also listed it as a key recommended chemical building material...
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