Guarantees, furnace

New catalyst The Vinnolit DC catalyst guarantees a furnace feed-EDC quality of > 99.9% without any distillation. Catalyst makeup is not... 

To ensure exothermic heat removal from the process, we are constrained by the process design to assign two control loops. We must control reactor inlet temperature with the furnace and control reactor exit temperature with the quench flow. Only by adjusting fuel to the furnace do we allow the reactor heat to be dissipated to the cooler. And only when the quench loop works do we guarantee that the furnace is operational. Because of this design we do not need a bypass line around the process-to-process heat exchanger. 

A burner manufacturer will typically guarantee a burner noise level at a location 3 feet (1 m) directly in front of the muffler. When several burners are installed in a furnace, however, the noise level 3 feet (1 m) from the burner may be higher than for a single burner due to the noise contribution from surrounding burners. The purpose of this section is to give an example that illustrates the noise level increase due to noise emitted from surrounding burners. 

In the ordinary furnace test for gas corrosion the samples are placed in a furnace for a given time in the atmosphere of interest. The advantage of the furnace test is that many different samples can be tested in one set of conditions, the drawback that it gives only one data point in time per experiment. The pitfalls are apparatus related Temperature and atmosphere constancy have to be guaranteed, crosscontamination must be avoided, and interaction with furnace linings and crucible material minimized. The danger of those points is often underestimated there are reports of different results from a mere change in the furnace size [27]. 

Differential scanning calorimetry (DSC) analyzes thermal transitions occurring in polymer samples when they are cooled down or heated up under inert atmosphere. Melting and glass transition temperatures can be determined as well as the various transitions in liquid crystalline mesophases. In a typical DSC experiment, two pans are placed on a pair of identically positioned platforms connected to a furnace by a common heat flow path. One pan contains the polymer, the other one is empty (reference pan). Then the two pans are heated up at a specific rate (approx. 10 K min ). The computer guarantees that the two pans heat at exactly the same rate -despite the fact that one pan contains polymer and the other one is empty. Since the polymer sample is extra material, it will take more heat to keep the temperature of the sample pan increasing at the same rate as the reference pan. A plot is created where the difference in heat flow between the sample and reference is plotted as a function of temperature. When there is no phase transition in the polymer, the plot parallels the x-axis, and the heat flow is given in units of heat, q, supplied per unit time, t ... 

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