Tieng anh nganh hoa

C. Translate into English
1. Nc thi bao gm các loi nc thi sinh hot, nc ma và nc thi công nghip.
2. Nhiu thành ph trong nc ta ch có nhng h thng x lý nc thi n gin hoc thm chí cha
có.
3. Bc x lý u tiên là cho lng các ht l lng ln trong các b lng.
4. BOD là s o kh nng oxy hóa sinh hc ca các cht hu c có trong nc thi.
5. Bùn hot tính cha các vi sinh vt phân hy có hiu qu t 75 - 95% cht hu c có trong nc
thi.
UNIT 18 :
CHEMICAL ENGINEERING
Chemical engineering, like other branches of engineering, is concerned essentially with applied
physics. In actual practice the chemical engineer is principally concerned either with physical operations
entirely or with the purely physical effects of chemical reactions, such as the transport of solids, fluid
flow, mixing and agitation, heat transfer, etc. To obtain the product of a chemical reaction in a marketable
form further operations may be involved, such as filtration, crystallization, distillation, evaporation,
drying, and grinding. These, in fact, are also physical operations, and the indicating appliances used to
control them are usually based on physical rather than on chemical principles.
One of the most important contributions of the chemical engineer is to guide industry in the
choice of materials for the construction of plant. The chemical engineer can select materials suitable for
each particular part of the plant, with consequent improvement in the life of the apparatus and general
economy in working. Examples may be found in the development of metals capable of resisting
corrosion, chemical reagents, heat and creep at high temperatures.
New processes call for new technique in plant design. Today there is much talk of the production
of motor spirit and other oils by high-pressure reactions. Such developments would still be at the
laboratory stage had it not been for the work of the chemical engineer in taking advantage of the
development of high-tensile steel and then applying his special knowledge to the design of new kinds of
plant in which hydrogen and other gases and vapors are handled at high pressure and temperatures.
Thus, commercial success in translating a laboratory method of a preparation into a full-scale
manufacturing process depends as much upon the careful plant design as upon consideration of the
precise chemical reactions to be employed; in short, industrial efficiency and the profits expected to
accompany this can only be realized by sound chemical engineering.
EXERCISES
A. Read and translate into Vietnamese
engineering, branches, physical operations, agitation, heat transfer, marketable form, grinding, drying,
evaporation, crystallization, construction, reagents, creep, motospirit, full-scale, sound chemical
engineering
B. Answer the following questions
1. What is the chemical engineering concerned?
2. What is the most important contribution of the chemical engineer?
3. Can you tell some main operations involved in the industrial process?
4. What is the commercial success of scientific research of chemical reaction?
5. How can you get the industrial efficiency?
C. Translate into English
1. Trong thc t hin nay, các quá trình hóa hc liên quan ch yu n các quá trình vt lý hay tác
ng vt lý lên các phn ng hóa hc.
2. Công ngh hóa hc cn chn các nguyên vt liu thích hp cho xây dng nhà máy tng ng.
3. Chúng ta cn phi tìm các loi kim loi có kh nng chng c n mòn, có kh nng giãn n
nhit cao.v.v.
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