SYNTHESIS GAS (STEAM REFORMING OF NATURAL GAS)
Synthesis gas may be produced from a variety of feedstocks. Natural gas is the preferred feedstock when it is available from gas fields (non-associated gas) or from oil wells (associated gas). The first step in the production of synthesis gas is to treat natural gas to remove hydrogen sulfide.
The purified gas is then mixed with steam and introduced to the first reactor (primary reformer). The reactor is constructed from vertical stainless steel tubes lined in a refractory furnace. The steam to natural gas ratio varies from 4–5 depending on natural gas composition (natural gas may contain ethane and heavier hydrocarbons) and the pressure used.
Many chemicals are produced from synthesis gas. This is a consequence of the high reactivity associated with hydrogen and carbon monoxide gases, the two constituents of synthesis gas.
The two major chemicals based on synthesis gas are ammonia and methanol. Each compound is a precursor for many other chemicals:
1. From ammonia, urea, nitric acid, hydrazine, acrylonitrile, methylamines and many other minor chemicals are produced (see Figure 1). Each of these chemicals is also a precursor of more chemicals.
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
|