Team BAT designed a small-scale process to use the crude glycerin waste from an up-steam biodiesel facility. Research on an industrially available propylene glycol manufacturing process, patented by GTC Technology, and a universal process for purifying crude glycerin were used guided the final design Ding et al. The facility is divided into two sub-processes:
Plus the introduction of environmental tax at the beginning of the year, is a milestone year for the chemical industry when environmental rectification is carried out.
Today, PUdaily would like to talk about the challenges faced by chlorohydrination process and the corresponding possible solutions.
From tomore units using cooxidation process and direct oxidation proccess will be built.
If all the units are put into production as planned, the additional capacity will amount to more than 1 million tons per year. This will undoubtedly have a great impact on PO producers using the traditional chlorohydrination process.
The large amounts of waste water, waste gas and waste residue make the chlorohydrination process an environmentally unfriendly process. However, thanks to the efforts of many PO manufacturers many new technologies and solutions emerge, providing new approaches Production of propylene solve the problem.
The main components of chlorohydrination tail gas are propane, propylene, oxygen, nitrogen and water. In order to avoid the safety hazards such as explosion caused by conventional oxidation treatment, the main treatment method in the industry is to mix the waste gas with a large amount of air and then pump them into the combustion furnace.
In the combustion furnace, propylene and propane are combusted as fuels. The tail gases discharged from the furnace are mainly carbon dioxide and nitrogen, which completely meet the environmental standards in the testing.
Tail gases from other apparatus include propylene, propane, epoxy propane, dichloropropane, nitrogen, oxygen and water. All these tail gases will be pumped into the water scrubber after nitrogen blanketting.
Propylene oxide and propylene dichloride dissolve in the water. Other water-insoluble gases are recovered for additional chlorohydrination. Propylene oxide dissolved in the water is recovered using the distillation column, thus increasing the output of the chemical.
Other wastewater in which organics are dissolved is discharged into the sewage-treatment plant. In China, this waste water is generally discharged into the wastewater treatment plant for treatment. For example, Shandong Department of Environmental Protection has proposed a technical specification aiming at restricting the discharge of high-salinity wastewater into inland rivers.
In response, some enterprises discharge such waste water into the sea after it is treated to meet the standards. It is reported that desired results are achieved. The waste residue, fly ash and attle can be used as raw materials to make standard bricks for building use, whose quality is even better than that of clay bricks.
Presently, the production of solid clay bricks has been banned because of its heavy consumption of land resources. It is expected that there is a broad market for the bricks made using waste residue.
In addition, the waste residue will probably be widely used in construction, roads building and other fields. It is their sustained efforts that have made it possible to improve this process. At the same time, PUdaily holds that although the more environmental-friendly cooxidation process and direct oxidation proccess are the trend, considering the many limiting factors, the chlorohydrination process will not be eliminated in the short term.
But it must be admitted that the additional costs incurred may make the advantage of low price disappear. PUdaily will keep an eye on the developments of PO production processes. Also, we hope the researchers will make further progress in improving the chlorohydrination process, ensuring environmental protection and costs controlling.Propylene is one of the largest volume petrochemicals, with a current worldwide production capacity of around million metric tons for polymer and chemical grades.
The industry is somewhat unique. to waste treatment. The distillate (Stream 19) is sent to T where propylene is separated from acrolein and the remaining water in the system.
The distillate from T, contains % propylene. The possibility of recycling this stream can be investigated. The bottoms (Stream 21) is then sent to T where acrolein is separated from water. The primary goal of this research was to find a renewable synthesis method for the production of propylene oxide.
Significant quantities of glycerin are formed as a co-product when soybean oil is used to produce bio-diesel. Find Propylene glycol, FEMA No , and other food and flavor ingredients at r-bridal.com Propylene glycol (C3H8O2, PG) is produced from propylene oxide (C3H6O, PO) by liquid Use BATCH PLUS to simulate the production of one batch of propylene glycol and determine the batch cycle time, using the above specifications.
Have BATCH PLUS prepare a 3-batch Gantt chart. Propylene is produced from naphtha, natural gas liquids in refinery units, and to a much smaller extent, coal, and is essential for the production of polypropylene plastics such as films and packaging, and a wide variety of other uses.