化工专业英语 (1).ppt

PART2CHEMICALTECHNOLOGIES

Unit5BasicChemicalsBeforereadingthetestbellow,trytoanswerthesequestions.

1.Canyoulistsomekindsofbasicchemicalswhichareproducedinthehighestvolume？2.Whatisthemaintaskofthebasicchemicalindustry?3.Haveyougotanyideaaboutthescaleandpriceofabasicchemical？4.Whatarethechallengesthatthebasicchemicalindustryisnowfacing?

Wecandividethevarioussectorsofthechemicalindustryintothesetwotypes:thehighervolumesectorandlow-volumesector.Inthehigh-volumesector,individualchemicalsaretypicallyproducedonthetenstohundredsofthousandsoftonnesperannumscale.Asaresult,theplantusedarededicatedtothesingleproduct,operateinacontinuousmannerandarehighlyautomated,includingcomputercontrol.Annual：adj每年Annum：n年bededicatedto:献身于，致力于参考译文我们可以把化学工业的各部门分成两类：大批量生产部门和少量生产部门。大量生产部门中，单独一个化学品常以每年几万乃至几十万吨的数量生产。结果，所用工厂常致力于一个产品，以连续方式操作、高度自动化，包括计算机控制。Sectors(categorizedashigh-volume)aresulphuricacid,phosphorus-containingcompounds,nitrogen-containingcompounds,chlor-alkaliandrelatedcompounds,pluspetrochemicalsandcommoditypolymerssuchaspolythene.Withtheexceptionofthelatter,theyarekeyintermediates,orbasechemicals,whicharefeedstockfortheproductionofawiderangeofotherchemicals,manyofwhicharealsorequiredinlargequantities.Categorize：vt分类ClassifyCategoryn分类Classification参考译文属于大量生产的部门有硫酸、含磷化合物、含氮化合物、氯碱以及相关化合物，再加上石油化学品及如聚乙烯的商品高分子。除后者外，它们是关键中间体或基本化学品-它们是生产广大其他化学品的原料，它们中的许多也要大量的生产。withtheexceptionof:除……之外Polythene=PolyetheneIncontrast,low-volumesectorsarelargelyinvolvedinfinechemicalsmanufacture,andindividualproductsareproducedonlyonthetensoftonnestopossiblyafewthousandtonnnesscale.However,theyhaveaveryhighvalueperunitweight,incontrasttohigh-volumeproducts.Finechemicalsareusuallyproducedinplantso