Product name: Vinyl acetate; vinyl acetic ester
Surname of product: Vinyl acetic ester; VAC
Molecular formula: CH3COOCHCH2
1.2. Process Route & Property Index
2.1Process Route
At a certain temperature of steam, through use of zinc acetate and active carbon as catalysts, acetylene and acetic acid are synthesized to form vinyl acetate by acetylene gas-phase method.
2.2Property Index
Vinyl acetate is a colorless, flammable liquid with a sweet and aromatic smell of ether. Its relative density is 0.9317 (20), with a melting point of -93.2 C, a boiling point of 72.2 C, a flash point (in a open cup) of -7.78 C, and a refractive index of nD 1.3953. It can be mixed with ethanol and is soluble in several organic solvents such as ether, acetone, chloroform and carbon tetrachloride, but not easily soluble in water and polymerizing.
1.3.purpose and Application
Vinyl acetate is a basic organic chemical raw materials mainly applied in production of polyvinyl alcohol, polyvinyl butyral, vinyl acetate emulsion, copolymer of vinyl acetate and ethylene (EVA resin and VAE emulsion etc), multipolyers (of vinyl acetate and acrylic acid, butenoic acid, maleic acid and other unsaturated acid and unsaturated acid ester), and products of alcoholysis (vinyl acetate and ethylene etc). These products are widely used in textile, coating, adhesive, film, pharmaceutical, organic synthesis, fine chemical, and daily chemical industries.
1.4.Packing and Marking
In order to prevent polymerization due to excessive heat or impurity during a long period of packing, storage and transport, a certain amount of polymerization inhibitor should be added to vinyl acetate. As the greater the activation degree of vinyl acetate, the poorer its polymer ability will be, a variety of polymerization inhibitors should be added and the amount of the inhibitors be changed accordingly, to prevent vinyl acetate from polymerization. To add the inhibitor does not change the inflammable and explosive nature of vinyl acetate. However, storage duration of vinyl acetate without inhibitors usually can not exceed 24 hours.
Iron or copper barrels, or iron, aluminum and copper tankers can be used for transport of vinyl acetate. For storage of vinyl acetate monomer, stainless steel is the best material. All barrels, tanks and other types of containers should be free from fat or other impurities. Before loading, the containers should be sufficiently leached with vinyl acetate. And when a new iron tanker is used for the first time, additional polymerization inhibitor must be added into it.
When vinyl acetate is stored at the ambient temperature, the upper space of storage vessels should be protected by access to nitrogen, preventing vinyl acetate steam from formation of explosive mixture with air. At the same time, storage vessels and pipelines should be connected with conducting wires and properly earthed to avoid static electricity. It is prohibited to empty vinyl acetate vessel or unload it by way of air pressurization.
All personnel involving production of vinyl acetate must familiarize themselves with rules regulations on safety to ensure safety.
1.5.Product Standard
Vinyl acetate applies to the enterprise standard Q/YWJ 5403-2006 for VAC Resin.
Technical Specifications
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Items |
Technical requirement |
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Best quality |
First quality |
Qualifier |
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Appearance |
Colorless and transparent |
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Density(20),g/cm3 |
0.930~0.934 |
0.930~0.934 |
0.929~0.935 |
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Free acid (as acetic acid),% |
0.005 |
0.010 |
0.020 |
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Aldehyde(as acetaldehyde),% |
0.02 |
0.04 |
0.05 |
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Dry residue,% |
0.005 |
0.05 |
0.10 |
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Water content,% |
0.04 |
0.10 |
0.20 |
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Activity (second) (frothing time), second |
660 |
690 |
720 |
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Color(platinum-cobalt scale) |
5 |
10 |
15 |
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Purity,% = |
99.80 |
99.70 |
– |
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Boiling range (101.3kpa),C |
71.0~73.5 |
71.0~73.5 |
71.0~73.5 |
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1.6.Attentions on Safety, Storage and Transport, and Emergency Measures 6.1 Briefing on Toxicity
6.1.1 Toxicity: the hamster LD50 of this product is greater than 2900 mg/kg, which shows the product is a low toxic.
6.1.2 Harm to health: inhalation of VAC may irritate the respiratory tract and cause bronchitis.
6.1.3 Skin contact may cause pox, blister or skin irritation.
6.1.4 Eye contact may cause irritation to the eyes and any damage to the corneas.
6.2 Attentions on Transport
6.2.1 The exhaust-pipes of trucks for transporting VAC must be equipped with a fire retardant device. Use mechanical equipment and tools for loading and unloading which sparkle easily. For transport along a highway, follow the route as stipulated by local competent communications authority and do not stop in any residential areas or in densely populated area. For railway transport, shunting is prohibited. Bulk transport by wooden boat or concrete ship is also prohibited. Besides, places for stopover should be located far from the source of fire and heat, or any high-temperature area. Mixed loading and shipping with strong oxidizer and food-grade chemical products are strictly prohibited.
6.2.2 Mixed loading and shipping with strong oxidizer and food-grade chemical products are strictly prohibited.
6.2.3 Upon transport, the vehicles should be equipped with certain sorts and adequate amount of fire-fighting apparatus and materials or equipment for emergency treatment of leakage.
6.2.4 Morning and evening are better time for transport in summer. Upon transport every tanker (truck) should bear a piece of earthing chain. In the vessel (tank) partition boards with holes should be added to minimize vibration which may produce static electricity.
6.2.5 Exposure to the blazing sun or high temperature should be prevented during transport.
6.3 Attentions on Storage
6.3.1 Store it in shady, cool and ventilative warehouses.
6.3.2 The temperature in the warehouses should be no greater than 37 C and far from source of fire and heat.
6.3.3 Airproof packing is required. Contact with air should be avoided.
6.3.4 In placement and storage, separate VAC from oxidants, acids and alkalis. Do not mix them. Storage in large quantity or a long period is inadvisable.
6.3.5 Equip the warehouse with fixed fire-fighting apparatus and materials.
6.3.6 Adopt explosion-proof lighting and ventilating facilities.
6.3.7 Equipment and materials for emergency treatment of leakage should be made available in storage areas.
6.4 Emergency Measure:
The fire extinguishing agents for the product can be foam, dioxide, dry powder or sandy soil. When putting out fire, the fire fighter should stand windward to operate the fire extinguisher.