Finding:

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   Illegal drug trade in the People's Republic of China

   China produces over 100,000 metric tons of acetic anhydride each year, and imports an additional 20,000 metric tons from the United States and Singapore. ... Opium produced in these areas is not converted into heroin, but is consumed locally by the ethnic minority groups in these isolated areas.
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   Opium

   Map showing the amount of Opium produced in China in 1908 ... Morphine is converted into heroin by a simple chemical reaction with acetic anhydride, followed by a varying degree of purification.
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   Heroin

   He boiled anhydrous morphine alkaloid with acetic anhydride over a stove for several hours and produced a more potent, acetylated form of morphine, now called diacetylmorphine. ... This precipitate is the so-called "no. 4 heroin", commonly known as "china white".
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   Clandestine chemistry

   Many manufacturers and suppliers exist in Europe, China, India, the United States, and a host of other countries. ... All other heroin producing countries must import large amounts of acetic anhydride.
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   Papermaking

   Hemp wrapping paper, China, circa 100 BC ... Internal sizing agents like alkylketene dimer (AKD) or alkylsuccinic anhydride (ASA) are added to control the hydrophobicity of the paper, which determines how much water the paper will absorb.
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   Sulfur dioxide

   | Other names | sulfur(IV) oxide; sulfurous anhydride | ... ↑ China has its worst spell of acid rain, United Press International.
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   Reversible inhibition of sperm under guidance

   It has been patented in India, China, Bangladesh and the United States. ... One explanation is that the polymer is an anhydride, and hydrolizes in the presence of water in the spermatic fluid.
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   Abiogenic petroleum origin

   Anhydride hypothesis, a New Theory of Petroleum and Coal Generation, is offered by C. Warren Hunt (1999). ... ↑ "ABIOGENIC HYDROCARBON ACCUMULATIONS IN THE SONGLIAO BASIN, CHINA" (PDF).
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   Di-tert-butyl dicarbonate

   | Other names | di-tert-butyl pyrocarbonate Boc anhydride Boc2O | ... This route is currently employed commercially by manufacturers in China and India.
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    Environmental effects of coal

    Further, acid rain may occur when the sulfur dioxide produced in the combustion of coal, reacts with oxygen to form sulfur trioxide (SO3), which then reacts with water molecules in the atmosphere to form sulfuric acid (see Acid anhydride for more information). ... China

Explore the following pages on Powerset:

• Illegal drug trade in the People's Republic of China,
• Opium,
• Heroin,
• Clandestine chemistry,
• Papermaking,
• Sulfur dioxide,
• Reversible inhibition of sperm under guidance,
• Abiogenic petroleum origin,
• Di-tert-butyl dicarbonate,
• Environmental effects of coal