Rishlyte 8023 is a cationic colour precipitant which removes colloidal/dissolved colour from sugarcane juice prior to the separation of mud. It is used at a low dosages and added to the limed and sulphited juice emerging from the juice sulphitor. After addition of Rishlyte 8023, the limed and sulphited juice goes through the 'S' Juice Heater where the temperature is raised to about 103o-104oC. The flocculant is added at this stage at the entry of the clarifier. The clear juice emerging as supernatant of the clarifier has reduced colour to the extent of 30 - 60% depending on the nature of colour causing substances which finally translates into a minimum of 25 - 30% reduction in colour of sugar produced from this juice.
Rishlyte 8028 is a highly cationic product effective as a decolourisation agent for syrup clarification in the phosflotation process (also known as Blanko Directo Process) and is used at dosages upto 150 ppm of polymer by weight of sugar solids. It is effective in removing most of the colour and also high molecular weight impurities such as starch and dextrane which results in good decolourisation as well as good filterability of clarified liquor. The colour of the syrup through use of Rishlyte 8028 reduces as much as 30 - 60%.
The unsulphured syrup is treated with the colour precipitant while it is being pumped to a buffer tank which also acts as a feed tank for the clarifier. The treated syrup is passed through a heat exchanger to raise its temperature to 70o - 75oC which is then mixed with phosphoric acid and lime superheat (if needed) in a specially designed flash reactor to create primary flocs.
Rishfloc 8160 is a high molecular weight anionic flocculant and is non-toxic. It is added prior to the clarification of sugarcane juice and at dosages of 1 - 2 ppm.
When applied it results in fast settling of the mud in the clarifier. The addition of Rishfloc to the clarifier promotes drier cakes and increased filter clarity of the muddy juice going to the filter from the clarifier under-flow.
Rishabh's defoamers are highly effective antifoaming and defoaming agents which spontaneously and continuously removes the foam which occur in internal operations in sugar factories.
Rishabh Defoamers are developed with a view to reduce surface tension at the liquid to air surface and thus eliminate foam. The type and quantity of defoamer to be used would depend on the quality of foam, pH of the medium etc., and would have to be determined by laboratory trials.
As they are non-ionic defoaming agents, they are non-saponifiable, and therefore have an excellent long term effect. Their chemical stability ensures that they do not decompose and remain effective even after long periods in the juice. Thus, when Rishabh's defoamers are added at tthe extraction stage, the defoaming effect of the product continues through the juice clarification and evaporator station.
Rishlyte antiscalants are phosphorous-free, low molecular-weight polymers, and are non-volatile and practically stable to hydrolysis at the temperatures in question. These polymers inhibits scale formation in evaporators caused due to the presence of hardness components in the sugar juice. The hardness components are generally calcium and magnesium ions in the presence of carbonate, oxalate and sulfate ions. This scale prevents effective heat transfer in the evaporator stages, leading to increased energy costs (based on the sugar obtained). In addition, production losses due to shutdowns of the evaporators for cleaning and scale removal during the sugar campaign must be reckoned with.
The mode of action of Rishlyte polymer is principally a result of the "Threshold effect", i.e. it is used in strongly substoichiometric amounts calculated on the hardness components. Inhibition of the scale-forming components begins at a concentration of 2 - 10 ppm (= g/metric ton) of polymer. This so-called "Threshold" concentration is dependent on the initial hardness of the sugar juice, and the duration of the thermal influence in the evaporator (detention time).
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