Manufacturing

Multiproduct Plants by Joachim Rauch

By Joachim Rauch

Within the chemical undefined, simply in time supply and ever extra effective methods are best necessities for competitiveness. excessive finish items require a large product range leading to decrease amounts of every unmarried product. the reply to the matter are multiproduct crops designed to fulfill altering necessities. Already at layout level, varied strength necessities are considered permitting technical gear to be put in in line with the specified product. Reconfiguration could be completed speedy via trade of available elements with out expensive refitting ot the complete plant. this is often the 1st finished resource of data in this sleek subject, treating different strategies recognized for multiproduct vegetation, their technical attention, attainable makes use of for the creation of chemical compounds, the alternative of the development fabrics, in addition to security issues.

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From this, a model simulating the multiproduct plant in which the processrelevant steps are carried out can be produced. Gaps in the description of the process, for example, factors that are only afterwards recognized to be crucial determinants of the reaction, can be filled in by screening or basic experiments or by additional determinations of material properties. The steps required for the introduction of the substitute coolant, from modified process parameters and adjusted campaign plans, up to changed logistics, can be determined on this basis.

These data show that the available torque may be lower than in the above shovel-drier version; this means that the handling of a wide variety of product consistencies is only possible at low revolutions and correspondingly high torque. The torque-dependent regulation of the number of revolutions makes adapting to the product consistency at hand possible. Another step in the same direction is the use of one or more fast-running mills or choppers (Fig. 26: Druvatherm of Lödige), incorporated into the apparatus and operating in the space between the shovel elements.

Heating of the blades is more a protective measure than an intentional part of the process. A significant increase in the heat-transfer surface per unit volume was no longer possible in the two concepts discussed above. For these reasons, some firms initiated the development of what can be regarded as self-cleaning kneaders. They can be differentiated into single-shaft apparatus, with permanent kneading/cleaning elements (Fig. 28, Discotherm B batch of List, another similar model is Reactotherm RT of KraussMaffei) and double-shaft apparatus (all-phase reactor, or AP reactor batch of List), in which the meshing action of the shafts results in mutual cleaning.

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