The phrase "although richer" is correct and usable in written English.
It can be used to introduce a contrast or exception in a sentence, typically following a statement about something being less rich or valuable.
Example: "The new product is more expensive, although richer in features compared to its predecessor."
Alternatives: "even if wealthier" or "despite being more affluent".
On the other hand, steam hotter than 400°C, although richer in energy, is harder to find and to handle.
Although richer parts of Britain do tend to outperform more deprived areas overall in the social mobility index designed by researchers, that is not always true.
Although richer people do seem to be happier than poorer people, that effect seems to have less to do with your material living standards in themselves than how your rank compares to others.
Although richer households obviously spend more on electronics, this is not a yuppie phenomenon: even people who don't have projection TV's in their homes are buying a lot of electronic equipment.
Although richer nutrients and more initial cells improved the fermentation of the hydrolysate, strain performance was still a distinct disadvantage.
The economics literature demonstrates that although richer nations do not experience fewer natural disasters than poorer nations, richer nations do suffer less death and long-term property damages from disaster (Kahn 2005; Toya and Skidmore 2007).
But Justice Scalia said the government was oblivious to the risk that "although rich individuals can take out their own television ads, a party which gets contributions from Joe Sixpack in 5 and 10 dollar amounts cannot do that to support a candidate".
Although rich crab grounds come with the islands, Japanese are moved by sentiment.
Microsoft, although rich and powerful, lags in new fields like smartphone software.
Although rich with empirical cases, the literature theorizing and empirically investigating the relationship between AC and SL is highly fragmented.
Although rich in fish and long used as a shelter by Chinese and Philippine fishermen, Scarborough Shoal has no major economic or strategic value.
