What types of liquefied gas raw materials can be used to produce vehicle-grade liquefied gas?

The best would be liquefied gas produced from oil fields, which contains virtually no olefins. Catalytic liquefaction of gas is also possible; all of these feed gases need to be further desulfurized to meet the standards for gas used in vehicles.

Liquefied gas is produced in oil and gas fields, as well as in coking, reforming, and catalytic processes; it needs to be refined due to its sulfur content.

The standards for liquefied gas in vehicles are currently based on foreign standards, which are too strict. . . Based on the current practices in refineries, the technical challenge in producing liquefied gas for vehicle use is the removal of olefins (to no more than 10%). . . As well as the strict requirements regarding sulfur content (half of the total sulfur limit for household gas). . . :lol Last edited by wangsc on 2009-2-15 13:21 ]

By purifying the propane in liquefied gas to a purity of over 99%, it can be used as vehicle-grade liquefied gas. There is no need to add equipment; simply improving the operation of the vapor separation unit will suffice.

Technically, there should be no problems; the main issue is market development. Currently, most gas stations use liquefied natural gas.

Project Quality indicators Test methods Propane for use in vehicles Propane-butane mixture for use in vehicles Vapor pressure at 37.8°C (gauge pressure), kPa: ≤1 430; ≤1 430 According to GB/T 66021) Composition (φ), %: Propane ≥60 According to SH/T 0230; Butane and higher components ≤2.5; Pentane and higher components ≤2 Propylene ≤5; ≤5 Residues: Residue after evaporation of 100 mL, mL: ≤0.05; ≤0.05 According to SY/T 7509 Oil stain test: Pass; Pass Density (at 20°C or 15°C), kg/m3: Measured experimentally; Measured experimentally According to SH/T 02212) Copper sheet corrosion: Not more than grade 1; Not more than grade 1 According to SH/T 0232 Total sulfur content ω (×10-6) (mass fraction): ≤123; ≤140 According to SY/T 7508 Free water: None; None Visual inspection 1. The vapor pressure can be calculated using the method specified in GB/T 12576, but it must be determined using GB/T 6602 in case of disputes. 2. The density allowance may be calculated using the GB/T 12576 method, but it must be determined using SH/T 0221 in the event of arbitration. It can be seen that there are virtually no olefins present. In refineries designed for fuel production, the sulfur-containing liquefied gas from the reforming unit and the light gasoline from the vaporization tower are both excellent raw materials. Additionally, the liquid hydrocarbons obtained from coking can be fed into the pre-hydrogenation stage of the reforming unit, and the resulting liquid hydrocarbons can be used as liquefied gas for vehicles.

It’s propane, and some butane can also be added

The source of gas for vehicles is, firstly, gaseous natural gas obtained through the liquefaction of natural gas or by compression using air compressors； The second is the LPG by-products from refineries. . . LNG and CNG will not be discussed in detail here. . . Speaking solely of LPG for vehicles. . . There are basically two types of LPG for use in vehicles: one is based primarily on propane ； First, it is mainly mixed tetrahydrocarbons. . . The production process mainly involves gas separation, with a focus on deep desulfurization; the challenge lies in meeting the requirements regarding the total alkene content. . . The rest of the issues aren’t problems at all. . . It should be clear, however, that switching from gasoline to gas for vehicles is certainly environmentally friendly and energy-saving; it represents not only a technological advancement but also a change in the way energy is utilized, and it will also drive innovation in the machinery industry. . . It’s a good thing. . . It will also provide a good market for the processing and marketing of carbon four components in refineries. . . :lol