Copper chloride sweetening

Other waste streams from the process result from water washing of the treated product and regeneration of the treating solution such as sodium plumbite (Na2Pb02) in doctor sweetening. These waste streams contain small amounts of oil and the treating material, such as sodium plumbite (or copper from copper chloride sweetening). 

Removal of the objectionable odors due to the presence of H2S and mercaptans is the objective of the fuel sweetening process. Several methods can be utilized to remove these undesirable compounds including caustic washing, copper chloride sweetening, sulfuric acid treating, Merox processing, and hydrotreating. These methods will be discussed below. 

Ibid., No. 3, p. 122. Part V, Sweetening with Copper Chloride. 

Substantial quantities of soip- gasoline are being sweetened by oxidation of mercaptan Sulfur by means of oxygen and copper chloride solution. 

Oxidation Processes. These processes convert mercaptans into less odoriferous disulfides by such processes as the doctor, copper chloride, hypochlorite, and lead sulfide, processes. Since disulfides harm the lead susceptibility of gasoline and since the need of reduction of mercaptans to doctor sweet (0.0004 per cent) is being questioned, these processes are being gradually abandoned. However, catalysts or inhibitors of the 7>-phenylenediamine type, which in the presence of air cause mercaptans in some caustic-washed gasolines to be converted during a few days into disulfides (so-called inhibitor sweetening), continue to be used because of the cheapness of such a process. Small amounts of... 

Sweetening processes oxidize mercaptans to less odoriferous disulfides without actually removing sulfur. The most common sweetening processes are the Merox processes others include the lead sulfide, the hydrochloride, and the copper chloride processes. In the Merox process, a catalyst composed of iron group metal chelates is used in an alkaline environment to promote the oxidation of mercaptans to disulfides using air as a source of o gen. 

Copper sweetening. In this process, cupric chloride is used. The reaction is shown as ... 

Perco An early petroleum sweetening process, using an adsorbent bed containing copper sulfate and sodium chloride. 

Copper sweetening processes involving the oxidation of mercaptans to disulfides by oxygen in the presence of cupric chloride. 

Linde copper sweetening a process for treating gasoline and distillates with a slurry of clay and cupric chloride. 

UOP copper sweetening a fixed-bed process for sweetening gasoline by converting mercaptans to disulfides by contact with ammonium chloride and copper sulfate in a bed. 

The copper sweetening process involves the oxidation of mercaptans to disulfides and the reduction of cupric chloride to the cuprous state, as... 

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