The phrase "an essential demand of" is correct and usable in written English.
It can be used when discussing a requirement or necessity that is fundamental to a particular context or situation.
Example: "Meeting the deadline is an essential demand of this project to ensure its success."
Alternatives: "a crucial requirement of" or "a fundamental need of".
As those lines came out of his mouth – "Baby you're my everything, you're all I ever wanted / We could do it real big, bigger than you ever done it" – an essential demand of the festival was met.
According to egalitarian liberalism, the enactment of a social minimum is not a contingent, but pretty much an essential, demand of justice.
It would also be an essential demand for the rest of the UK.
The depletion of fossil fuel resources at a faster rate in the present world of economic competitiveness is generating an essential demand for increase in the efficiency of high temperature engineering components like internal combustion engines and gas turbines used in automotive, aerospace or power industries.
In the context of aquaculture systems for BLSS the continuous replacement of removed fish biomass is an essential demand.
Therefore, treatment of elite animals, increasing the number of camels as well as genetic improvement is an essential demand.
Both Al-Faisal and Alpher ignore the sensible and essential demand of President Obama in his May 19 speech: "How can one negotiate with a party that has shown itself unwilling to recognize your right to exist?
Now distancing itself from the essential demand of the protesters that the dictator must go, the administration has fallen back on the sordid option of backing a new and improved dictatorship.
Currently, the dental composites on the market can only meet essential demand of filling tooth but fail to be employed in high pressure-assuming positions.
Informed consent is an essential requirement of ethical research which demands that a research participants' rights should be respected.
Their key piece of evidence is the claim that spending on "basics" has been steadily falling as a share of income, showing that people are finding it ever easier to meet the essential demands of middle-class life.
