China Coal Energy Research Institute Co. Ltd.
School of Chemical Engineering,Northwest University
Department of Chemical Engineering

在“双碳”目标背景下,煤制1,3-丙二醇(PDO)生产工艺的绿色化改造对推动煤化工行业低碳转型具有重要意义。构建了一种基于煤制PDO的绿色生产工艺,研究了采用可再生原料(如电解水制氢、CO2变换制CO、CO2加氢制甲醇)与传统煤制PDO生产工艺的差异,重点分析了绿色工艺、绿氢、绿电和绿色蒸汽等低碳技术对PDO生产过程碳排放的影响。通过对不同情景下碳排放的对比分析,结果表明,传统煤制PDO生产工艺的碳排放量为527.34kt/a,而采用绿色合成工艺后,碳排放显著降低至382.14kt/a,仅为传统工艺的72.5%,表明绿色工艺本身具有良好的减排效果。当进一步引入绿电后,碳排放降至307.73kt/a,较绿色合成工艺减少了74.41kt/a,体现出绿电在碳减排方面的积极作用。最显著的碳减排效果发生在绿电与绿色蒸汽的结合情景下,此时碳排放降至114.49kt/a,较传统生产工艺减少了412.85kt/a,仅为传统工艺的21.7%。此外,在各个生产装置中,3-羟基丙酸甲酯合成装置的碳排放占比最大,主要来源于蒸汽消耗,而在绿色工艺情景下,引入绿色蒸汽可大幅降低该装置的碳排放。最后,PDO绿色工艺过程中的原料乙烯消耗是主要碳排放贡献因素,其贡献率超过88.6%,因此,未来可在原料乙烯的绿色低碳方面进一步探索,以降低整个PDO生产的碳排放水平。

Aiming at the "Dual Carbon" goals,the greeization of a coal to 1,3-propylene glycol (PDO) production process is of greatsignificance for promoting the low-carbon transition of the coal chemical industry. This study establishes a green production process basedon coal-based PDO and investigates the differences between the use of renewable raw materials-such as hydrogen production via waterelectrolysis,CO2 conversion to CO,and CO2 hydrogenation to methanol-and the traditional coal-based PDO production process. Thestudy focuses on analyzing the impact of green technologies,including green hydrogen,green electricity,and green steam,on the carbonemissions of the PDO production process. A comparative analysis of carbon emissions under different scenarios indicates that the carbonemissions of the traditional coal-based PDO production process amount to 527.34 kt/a. By adopting the green synthesis process,emissionsare significantly reduced to 382.14 kt/a,accounting for only 72.5% of the traditional process,demonstrating the inherent emissionreduction benefits of the green process. The introduction of green electricity further reduces emissions to 307.73 kt/a achieving anadditional reduction of 74.41 kt/a compared to the green synthesis process,highlighting the positive role of green electricity in carbonreduction. The most significant reduction is observed in the scenario combining green electricity and green steam,where emissions dropto 114.49 kt/a - only 21.7% of the emissions from the traditional production process - representing a total reduction of 412.85 kt/a. Amongall production units,the methyl 3-hydroxypropionate synthesis unit contributes the highest proportion of carbon emissions,primarily due to steam consumption. However,in the green process scenario,the introduction of green steam can significantly reduce emissions fromthis unit. Additionally,ethylene consumption in the PDO green production process is the major contributor to carbon emissions,accounting for more than 88.6%. Therefore,future efforts should focus on exploring low-carbon alternatives for ethylene feedstock tofurther reduce the overall carbon footprint of PDO production.

国家自然科学基金联合基金项目(U24B6016);国家自然科学基金联合重点项目(22238006)

王帅,朱磊,吴乐,等.煤制丙二醇生产工艺的绿色化设计及碳排放分析[J].洁净煤技术,2025,31(3):94−102.

WANG Shuai,ZHU Lei,WU Le,et al. Greenization of a coal-to-propylene glycol production process and assesment ofcarbon emissions[J].Clean Coal Technology,2025,31(3):94−102.