What type of flow meter is used for VCM media?

VCM, vinyl chloride (CH2=CHCl), is a colorless gas that is easy to liquefy. Boiling point -13.4°C. Slightly soluble in water, soluble in ethanol and ether. It is toxic; long-term inhalation or exposure can lead to liver cancer. The flame edge is slightly green when burning. It forms an explosive mixture with air, with an explosion limit of 4–22% (by volume). Addition reactions can occur. Polymerization occurs under the action of initiators such as organic peroxides or azo compounds, resulting in the formation of polyvinyl chloride (PVC) plastic. It can also be copolymerized with certain unsaturated compounds to create modified variants that improve certain properties. Copolymers with vinyl acetate, used to manufacture films, coatings, plastic flooring, records, short fibers, etc ； For example, copolymers with vinylidene chloride CCl2=CH2 possess properties such as non-toxicity, transparency, and corrosion resistance; they can be used to manufacture fishing nets, seat cover fabrics, filter cloths, packaging films, etc. Their trade names include Saran and synthetic 1,1,2-trichloroethane. Industrially, it is produced by the addition of acetylene to hydrogen chloride in the presence of mercury salts, or by the chlorination of ethylene followed by pyrolysis to yield hydrogen chloride and vinyl chloride, as well as by the thermal cracking of dichloroethane. I really haven’t chosen “powerless” before; when VCM first showed it to me, I didn’t know what it meant, and it was only after looking it up that I understood

Vinyl chloride (VCM) is a gas at room temperature; using a rotor vortex flow meter should be fine in such cases. Be careful to watch for leaks, as it is toxic and explosive

Turbines and mass flow meters are generally chosen; if the budget allows, it is recommended to opt for a mass flow meter

The vinyl chloride monomer is characterized by its high volatility, and the coexistence of vapor and liquid states has a significant impact on the accuracy and stability of flow rate measurement; therefore, both the process engineering and automation instrumentation teams need to work together to prevent this issue. It is usually necessary to maintain a pressure in the flowmeter pipeline (above 0.4–0.6) to ensure that the vinyl chloride monomer remains in a liquid state. The flow measurement of vinyl chloride monomer typically includes volume flow and mass flow. Volume flow is usually measured using vortex meters, with an accuracy of around ±0.5–1.0% (for the liquid phase); however, the error becomes significant when there is a coexistence of liquid and vapor ； Mass flow meters have a high measurement accuracy, typically ranging from ±0.1-0.5%. For non-trade settlement or control of feed in agitated tanks, it is recommended to use vortex or swirl flow meters.

You mean liquid, right? Usually mass flow meters are good, like Rosemount.

Rotary flow meter. . . . . .

I’m going to the office tomorrow; I’ll check it for you. I’m a beginner and don’t know much, hehe

We choose a mass flow meter or a turbine flow meter; in our case, we opt for a mass flow meter. However, it is important to adjust the amount of VCM added according to the temperature. References: 1. Polyvinyl Chloride > Issue 3, 2008 > Selection and Application of Flow Meters for Vinyl Chloride Monomer Feeding. Selection and Application of Flow Meters for Vinyl Chloride Monomer Feeding. Author: ZHANG Wen-jing. 2. A Brief Analysis of the Selection of Instruments in Vinyl Chloride Plants, Proceedings of the 4th National Conference on Instruments and Automation Technology in the Petroleum and Chemical Industries. Zhao Guiqing

It is best to use a mass flow meter; turbines are prone to getting clogged by self-polymers, and Rosemount models can be chosen.

It is better to choose a mass flow meter