liquefaction process direct

liquefaction process direct

Liquefaction Process an overview ScienceDirect

The liquefaction process (coal was the feedstock of choice for many decades in the twentieth century) is a process used to convert a solid fuel into a substitute for liquid fuels such as diesel and gasoline. Coal liquefaction has historically been used in countries without a secure supply of petroleum, such as Germany (during World War II) and South Africa (since the early 1970s).

Direct Liquefaction an overview ScienceDirect Topics

Also known as indirect liquefaction, this is a process whereby the coal is gasified and the gases converted, by catalytic reactions, to liquid hydrocarbon compounds. 3. Hydrogenation or

10.6. Direct Liquefaction Processes netl.doe.gov

2021-6-12  Hybrid process approaches involving a combination of direct coal liquefaction and indirect coal liquefaction (in which gasification is an intrinsic step) have been proposed and may be increasingly important in new research and development in coal/biomass to liquids process technology. Description Direct coal liquefaction involves contacting coal directly with a catalyst at elevated temperatures and

Direct liquefaction mining process Britannica

In coal utilization: Liquefaction reactions of coal can be done directly, either from gaseous hydrogen or by a liquid hydrogen-donor solvent, or it can be done indirectly, through an

Direct liquefaction techniques on lignite coal: A review

2020-3-1  Interestingly, direct liquefaction is one of the important processes for obtaining valuable products from coal and low-ranking coals, such as lignite. The DCL process produces considerably high-variety and efficient products at low temperatures compared to the indirect coal liquefaction process.

Direct Coal Liquefaction an overview ScienceDirect

Direct liquefaction was developed in the 1930s by Bergius and collaborators and involved reacting pulverized coal or coal/oil slurries with gaseous hydrogen at high pressures and temperatures. It was used extensively in Germany during World War II and in the former Soviet Union and Czechoslovakia for several years after the war.

Indirect Liquefaction an overview ScienceDirect

Generalized direct liquefaction process train (Probstein and Hicks, 2006). Some of the designs from the late 1970s through mid-1980s include solvent-refined coal (SRC) processes I and II, Exxon Donor Solvent (EDS) process and the H-Coal process ( Lumpkin, 1988 ; Song, 2005 ;

Direct Coal Liquefaction mcilvainecompany

2009-9-28  Direct Liquefaction Process • A single-stage direct liquefaction process gives distillates via one primary reactor. Such processes may include an integrated on-line hydrotreating reactor, which is intended to upgrade the primary distillates without directly increasing the overall conversion.

A comparison of direct and indirect liquefaction

It is shown that although direct liquefaction conversion processes might be more energy-efficient, overall system efficiencies for direct and indirect liquefaction are typically comparable if...

A NEW LIQUEFACTION PROCESS SUITABLE FOR OFFSHORE

2019-1-19  A new liquefaction process in the latter category has been developed to increase overall efficiency among other advantages: With respect to conventional N2 cycles: Independent refrigerant cycles easy to start and operate, Possible onstream optimization through the adjustment of composition,

Direct Liquefaction SpringerLink

Direct liquefaction refers to several processes which rely on thermal energy, hydrogen, and solvent to produce high yields of liquid products from coal. The focus of research in this type of coal conversion has therefore been directly stimulated by process improvements related to one or more aspects of these processes—or the generic form of

SUMMARY REPORT OF THE DOE DIRECT LIQUEFACTION

2019-2-27  Subsequent process research and development work overcame the major technical and economic obstacles to commercialization of the process. As a result, direct liquefaction products that meet or exceed crude oil qualities can be made for about $30/bbl. The technology was shown to be applicable to a wide range of coals in the United States.

Direct Coal Liquefaction SchuF

Liquefaction Process In the first step of the direct coal liquefaction process, the coal is ground and mixed with oil to yield a pumpable paste. This paste is pumped to high pressure (200 300 bars) and is heated to the desired process temperature of about 450 460 °C.

Direct Coal Liquefaction mcilvainecompany

2009-9-28  Direct Liquefaction Process • A single-stage direct liquefaction process gives distillates via one primary reactor. Such processes may include an integrated on-line hydrotreating reactor, which is intended to upgrade the primary distillates without directly increasing the overall conversion.

A comparison of direct and indirect liquefaction

Direct coal liquefaction (DCL) is a technology for producing liquid products from coal. One of the byproducts from this process is coal liquefaction residue (CLR), which is remaining coal that was

(PDF) Recent progress in the direct liquefaction of

Liquefaction of biomass with proper solvents is a process that can prospectively be integrated with optimized conditions to produce fuel additives and valuable chemicals, simultaneously [31] .

8.2 Direction Liquefaction of Biomass EGEE 439

Direct liquefaction (particularly hydrothermal processing) occurs in a non-oxidative atmosphere, where the biomass is fed into a unit as an aqueous slurry at lower temperatures, with bio-crude in the liquid form being the product.

10.5. Indirect Liquefaction Processes netl.doe.gov

2021-6-10  Indirect Liquefaction Processes. Indirect coal liquefaction requires first gasifying the coal into a syngas. Therefore, while direct coal liquefaction (DCL) takes coal directly into a liquid phase, indirect coal liquefaction (ICL) consists of two major steps: (a) gasification to produce a synthesis gas (syngas); and (b) conversion of the carbon

Biomass Direct Liquefaction Options: TechnoEconomic

2015-6-16  Complete experimental mass balances were not available, and the studied process routes to transportation fuels weresomewhat premature. A comparison of high-pressure biomass liquefaction (i.e. hydrothermal liquefaction) and fast pyrolysis to transportation fuels is ed in Figure 3 below. Costs relasummariz ted to

Hydrogenation of heavy liquids from a direct coal liquefaction

2011-1-3  Hydrogenation of heavy liquids from a direct coal liquefaction residue for improved oil yield 通 首页 文档 视频 音频 文集 文档 搜试试 会员中心 VIP福利社 VIP免费专区 VIP专属特权 客户端 看过 登录 百度文库 互联网 Hydrogenation of heavy liquids from a direct

Direct Coal Liquefaction SchuF

Liquefaction Process In the first step of the direct coal liquefaction process, the coal is ground and mixed with oil to yield a pumpable paste. This paste is pumped to high pressure (200 300 bars) and is heated to the desired process temperature of about 450 460 °C.

Direct Liquefaction SpringerLink

Direct liquefaction refers to several processes which rely on thermal energy, hydrogen, and solvent to produce high yields of liquid products from coal. The focus of research in this type of coal conversion has therefore been directly stimulated by process improvements related to one or more aspects of these processes—or the generic form of

8.2 Direction Liquefaction of Biomass EGEE 439

Direct liquefaction (particularly hydrothermal processing) occurs in a non-oxidative atmosphere, where the biomass is fed into a unit as an aqueous slurry at lower temperatures, with bio-crude in the liquid form being the product.

Solvent recyclability in a multistep direct liquefaction

1995-12-31  A multistep direct liquefaction process specifically aimed at low-rank coals (LRCs) has been developed at the Energy & Environmental Research Center (EERC). The process consists of a preconversion treatment to prepare the coal for solubilization, solubilization of the coal in the solvent, and polishing using a phenolic solvent or solvent blend to complete solubilization of the remaining material.

Reaction Engineering of Direct Coal Liquefaction

Process Overview of Coal Liquefaction Direct coal liquefaction refers to the direct reaction of coal with hydrogen to form liquids. The hydrogen reacts with oxygen, sulfur, and nitrogen in coal to remove them as water, hydrogen sulfide, and ammonia.

A comparison of direct and indirect liquefaction

Direct coal liquefaction (DCL) is a technology for producing liquid products from coal. One of the byproducts from this process is coal liquefaction residue (CLR), which is remaining coal that was

Biomass Direct Liquefaction Options: TechnoEconomic

2015-6-16  assessment performed by the IEA Bioenergy Direct Biomass Liquefaction Task in the 19801 s.New developments in HTL and the upgrading of the HTL biocrude product triggered the interest in reinvestigating this comparison of these biomass liquefaction processes. In addition, developments in FP

(PDF) Recent progress in the direct liquefaction of

Liquefaction of biomass with proper solvents is a process that can prospectively be integrated with optimized conditions to produce fuel additives and valuable chemicals, simultaneously [31] .

神华煤直接液化项目最新进展

2014-7-3  I. Shenhua Direct Coal Liquefaction Process 3 一、采用自主知识产权的863液化高效催化剂 I. The 863 highly-efficient Liquefaction Catalyst with Independent IPR Employed 863 催化剂价格低、活性高、添加量少,油收率高

Hydrogenation of heavy liquids from a direct coal liquefaction

2011-1-3  Hydrogenation of heavy liquids from a direct coal liquefaction residue for improved oil yield_能源/化工_工程科技_专业资料 通过对煤直接液化残渣中重油加氢提高油产率